Urologic Diseases

24

Review clinical trials related to Urologic Diseases. Use filters to narrow results by trial status, phase, treatment, biological sex and sponsor.

Condition / disease
Location
Status: Recruiting

Safety and Feasibility Study of Autologous Engineered Urethral Constructs for the Treatment of Strictures

This is a Phase I clinical study to determine the safety and efficacy of using autologous, engineered urethral constructs for the treatment of urethral strictures in adult males. The proposed study design is a prospective non-randomized and uncontrolled single-center investigation. Autologous urothelial cells (UCs) and smooth muscle cells (SMCs), obtained from enrolled male subjects' bladder tissue samples, will be culture expanded in vitro and used to seed tubular PGA scaffolds to create autologous urethral constructs for the repair of urethral strictures.

Participants needed: 10
Trial details
Phase: Phase 1Age: 21-75Biological sex: MaleType: InterventionalSponsor: Wake Forest University Health SciencesUpdated: Jun 4, 2026Locations: 2
Eligibility criteria

Patients must be available for all follow-up visits. [+1]

Strictures of the meatus or prostatic urethra; any urethral stricture associated... [+24]

Status: Recruiting

Examining the Effects of Intra-detrusor Botox at Time of HoLEP in Men With Overactive Bladder Symptoms

The objective of our multi-center randomized single-blind study is to examine the safety and effect of intra-detrusor OnabotulinumtoxinA injections at the time of holium laser enucleation of the prostate (HoLEP) in men with overactive bladder symptoms with and without urge incontinence.

Participants needed: 66
Trial details
Phase: Phase 2, Phase 3Age: 18-89Biological sex: MaleType: InterventionalSponsor: Northwestern UniversityUpdated: Jun 4, 2026Locations: 1
Eligibility criteria

Males 18 -89 undergoing HoLEP [+3]

Allergy or hypersensitivity to OnabotulinumtoxinA injections [+5]

Status: Recruiting

Effect of Comprehensive Spa Care on Kidney and Urological Conditions: A Clinical Study in Adult Patients

This is a single-arm, pretest-posttest study evaluating the effects of a 21-day comprehensive spa care (Komplexní lázeňská léčebně rehabilitační péče, KLP) on patients with nephrological and urological conditions treated at a spa facility in Mariánské Lázně, Czech Republic. The study enrolls 150 adult patients (75 men and 75 women), aged 40-70 years, who are prescribed KLP for indications VIII/1 (recurrent and chronic non-tuberculous inflammation of the kidneys and urinary tract), VIII/2 (nephrolithiasis without urinary tract obstruction, nephrocalcinosis), VIII/3 (conditions after kidney and urinary tract surgery), and VIII/4 (chronic prostatitis or prostatovesiculitis resistant to pharmacological treatment). The spa treatment consists of the use of natural healing resources of Mariánské Lázně, including a mineral spring drinking cure, balneotherapy (mineral water baths), peloid therapy, carbon dioxide therapy, climatotherapy, exercise therapy, and dietotherapy. The standard treatment duration is 21 days, during which each patient receives a total of 63 therapeutic procedures and drinks mineral spring water three times daily. Patients undergo assessments at the beginning (days 1-3) and at the end (days 19-21) of their treatment. Assessments include physical examination, abdominal and urinary tract ultrasound, blood and urine sampling with laboratory analysis, body composition measurement using bioelectrical impedance analysis (InBody), and psychometric questionnaire surveys. The primary aim of the study is to objectively assess the therapeutic effect of comprehensive spa care on nephrological and urological diseases by comparing pre-treatment and post-treatment clinical, laboratory, and patient-reported outcomes. The study was approved by the Ethics Committee of the University Hospital and Faculty of Medicine in Pilsen (decision of November 2, 2023, ref. no. 437/23).

Participants needed: 150
Trial details
Age: 40-70Biological sex: AllType: InterventionalSponsor: Institute of Spa and Balneology, public research institutionUpdated: Apr 24, 2026Locations: 1
Eligibility criteria

Male or female aged 40 to 70 years [+4]

Contraindications according to Czech Decree No. 2/2015 Coll. on spa treatment cr... [+8]

Status: Recruiting

The Voided Urinary, Perineal, and Faecal Microbiota Among Children and Adolescents - the PpUF-study.

The aim of this study is to investigate whether the voided urinary, perineal/preputial, and the fecal microbiota are different between children suffering from Overactive Bladder (OAB) and Daytime Urinary Incontinence (DUI) compared to age- and gender-matched healthy children without bladder symptoms. Moreover, the study aims to investigate if the microbiota is different according to the severity of DUI and if the microbiota is changed throughout treatment of DUI. A follow-up study will as well be performed on healthy children to investigate how the microbiota evolves with increasing age and pubertal stage. Children with OAB and DUI will be recruited from involved pediatric departments, and specimen in the form of urine, perineal/preputial swabs, and feces will be collected according to the protocol.

Participants needed: 110
Trial details
Age: 5-17Biological sex: AllType: ObservationalSponsor: Aalborg University HospitalUpdated: Apr 17, 2026Locations: 4
Eligibility criteria

Overactive bladder as per International Children's Continence Society criteria (... [+4]

No known urogenital abnormality affecting the lower urinary tract function. [+7]

Status: Recruiting

Brain Activity Among Children With Overactive Bladder and Daytime Urinary Incontinence and Healthy Children

The aim of this study is to investigate whether the activity in brain areas controlling the bladder is different among children suffering from Overactive Bladder (OAB) and Daytime Urinary Incontinence (DUI) compared to age- and gender-matched healthy children without bladder symptoms. Moreover, the aim is to investigate if sacral transcutaneous electric nerve stimulation (TENS) has a central mechanism of action. Children with OAB and DUI will be recruited from involved pediatric departments, and functional magnetic resonance imaging (fMRI) will be performed before and after 10 weeks of sacral TENS. In healthy children without bladder symptoms, only the baseline fMRI will be performed.

Participants needed: 65
Trial details
Age: 6-14Biological sex: AllType: InterventionalSponsor: Aalborg University HospitalUpdated: Apr 20, 2026Locations: 4
Eligibility criteria

Overactive Bladder as per International Children's Continence Society criteria (... [+4]

Known urogenital abnormality affecting the lower urinary tract function. [+11]

Status: Not yet recruiting

Bioengineered Penile Tissue Constructs for Irreversibly Damaged Penile Corpora

The primary objective of this clinical trial is to evaluate the safety of autologous engineered corpora cavernosa + albuginea constructs for treatment of complex penile deformities. Autologous endothelial and smooth muscle cells obtained from enrolled subjects' corpora cavernosa biopsy sample, will be culture expanded in vitro and used to seed decellularized corpora cavernosa + albuginea obtained from cadaveric-donors to create autologous bioengineered corpora cavernosa/albuginea constructs for repair of damaged penile tissues.

Participants needed: 10
Trial details
Phase: Phase 1Age: 18-60Biological sex: MaleType: InterventionalSponsor: Wake Forest University Health SciencesUpdated: Mar 27, 2026Locations: 1
Eligibility criteria

Males aged 18-60 years. [+7]

Presence of untreated or incompletely treated urinary tract infection at the tim... [+21]

Status: Recruiting

Evaluation Patient Satisfaction After Passive Bladder Catheter Removal Compared to Active Removal

In usual practice, the removal of the bladder catheter is performed by a nurse a few days after the surgery. The nurse deflates the balloon and removes the catheter from the urethra by manual traction. To date, there are no solid data on the impact of passive catheter removal on patient satisfaction. It is therefore necessary to estimate the effect on patient satisfaction of active catheter removal by a nurse versus passive catheter removal under gravity. The effect on pain and anxiety will also be compared between the two techniques. The methodology used was that of an open-label randomized controlled trial.

Participants needed: 160
Trial details
Age: 18+Biological sex: MaleType: InterventionalSponsor: Hospices Civils de LyonUpdated: Mar 16, 2026Locations: 2
Eligibility criteria

Male ≥ 18 years old [+8]

Patient who is unable to perform intimate hygiene alone in a standing position [+5]

Status: Recruiting

A Study of Ward Admissions for Haematuria

This multicenter, prospective observational study will evaluate national and international practice variations (if present) in the emergency management of patients admitted to hospital with haematuria, inform a consensus guideline for best practice and provide evidence to design an implementation study to optimise haematuria management pathway.

Participants needed: 1,050
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: British Urology Researchers in Surgical TrainingUpdated: Feb 9, 2026Locations: 1
Eligibility criteria

Patients are included if they are over 16 years of age or older and admitted to... [+1]

any patients under 16 years of age [+2]

Status: Recruiting

Active Informed Consent: a New Solution to Improve and Objectively Test the Patient Understanding of Complex Surgical Procedures Proposals

This is an interventional, non-pharmacological, randomized controlled superiority study (RCT), multicenter, open label, parallel group. The aim is to evaluate the effectiveness of a new preoperative information method, based on multimedia tools and on the objective control of understanding by the patient candidate for spinal or urological surgery.

Participants needed: 300
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: Istituto Ortopedico RizzoliUpdated: Feb 2, 2026Locations: 1
Eligibility criteria

Adults aged ≥ 18 years (with full legal capacity to consent). [+3]

Patients under age: minors. [+2]

Status: Recruiting

Evaluation of AI Large Models for Diagnosis and Treatment in Real-World Cases: Multicenter Retrospective Study

This multicenter retrospective study aims to evaluate the diagnostic and therapeutic performance of three large language models-ChatGPT, Gemini and Deepseek-using 800 archived inpatient medical records from urology departments across four tertiary hospitals. The study will focus on the accuracy and applicability of these models in disease recognition, preliminary diagnosis and treatment recommendation generation, in order to explore their potential value and limitations in supporting clinical decision-making in real-world settings.

Participants needed: 800
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: First Affiliated Hospital of Fujian Medical UniversityUpdated: Jan 30, 2026Locations: 1
Eligibility criteria

The case data is sourced from the four hospitals involved in the study, with com... [+5]

Medical records with significant missing information, such as key clinical detai... [+5]

Status: Recruiting

VIrtual Reality Induced Pain and anxiEty Relief in Outpatient UROlogical Procedures

Though the efficacy of VRH is documented in various outpatient urological procedures and has provided promising preliminary information in prostate biopsy, its systematic use in urology remains poorly studied. Considering the potential of invasive urological procedures to induce significant patient discomfort, the application of innovative immersive approaches, such as those offered by medical devices, could lead to an overall clinical benefit. Among these, REALICA® (available from https://REALICA.io/en/), a class I CE medical device, widely used in hospitals and validated by numerous studies, represents a valuable resource in urology, supported by high satisfaction rates received in abdominal surgery and extracorporeal lithotripsy

Participants needed: 56
Trial details
Age: 18-99Biological sex: AllType: InterventionalSponsor: Istituto Oncologico Veneto IRCCSUpdated: Jan 13, 2026Locations: 1
Eligibility criteria

Male/female with age ≥ 18 years [+4]

Absolute contraindications to the planned urological procedure (e.g., active uri... [+7]

Status: Recruiting

Vorolanib in the Second-line Treatment of Patients With Unresectable or Metastatic Renal Cell Carcinoma

This is a multicenter real world study (RWS) initiated by the investigator. Eligible patients will be selected for treatment with second-line treatment including vorolanib and followed up. The real survival data of patients after medication will be collected and compared with the data of CONCEPT study, and multi-factor stratified analysis of the efficacy of voronib will be conducted.

Participants needed: 39
Trial details
Age: 18-80Biological sex: AllType: ObservationalSponsor: Jinling Hospital, ChinaUpdated: Dec 5, 2025Locations: 1Duration: 12 Weeks
Eligibility criteria

Subjects have fully understood and voluntarily signed the informed consent form... [+4]

A history of malignancies other than the disease studied within the past 5 years... [+15]

Status: Recruiting

PACT Programme for Parents of Children With SHCN

This randomised controlled trial aims to determine the efficacy of a 12-week, smartphone-based Prosocial-orientated Acceptance and Commitment Training (PACT) programme plus age-appropriate positive parenting advice on the psychological flexibility, prosociality, parenting competence and family functioning with parents of children with special health care needs as well as the mental well-being of parent-child dyads over 12 months follow-up.

Participants needed: 196
Trial details
Age: 21+Biological sex: AllType: InterventionalSponsor: Chinese University of Hong KongUpdated: Aug 13, 2025Locations: 2
Eligibility criteria

Cantonese-speaking Hong Kong residents [+3]

Parents who have diagnoses of severe mental illness or developmental disabilitie...

Status: Recruiting

Patient Satisfaction of Virtual vs In-Person Workup and Treatment of Lower Urinary Tract Symptoms.

This study is being done to compare usefulness of data collected in uroflowmetry, a test that measures the amount of urine released from the body, at home versus in the doctor's office. Additionally, investigators are assessing patient satisfaction when completing a virtual visit for lower urinary tract symptoms (LUTS), related to prostatic enlargement, compared to an in person visit. The three devices being investigated have not been used in the home setting to make urinary measurements as is typically done in clinic. The goal is to test the effectiveness and accuracy of these devices compared to our standard clinical practices and demonstrate their ability to provide useful information in the home setting.

Participants needed: 60
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: Indiana UniversityUpdated: Mar 13, 2025Locations: 1
Eligibility criteria

≥18 years of age [+3]

<18 years of age [+4]

Status: Recruiting

Laser Outcomes Associated With (Holmium Laser Enucleation of the Prostate) HoLEP Procedures

The primary aim is to assess the impact of laser setting frequency and wattage during holmium laser enucleation of the prostate. There is currently no gold-standard laser settings for HoLEP procedures. In the investigator's current high-volume practice, the following settings for enucleation are: 2j 50hz. These settings are conventional settings, but there is no literature to prove optimal laser settings. The investigators hypothesizes that utilization of higher laser settings may be associated with a clinically significant (defined as \> 10%) decrease in procedural time without any detrimental postoperative outcomes, and a utilization of lower laser settings may be associated with a clinically significant (defined as \>10%) reduction in postoperative irritative voiding symptoms without any detrimental postoperative outcomes.

Participants needed: 300
Trial details
Age: 18-89Biological sex: MaleType: InterventionalSponsor: Northwestern UniversityUpdated: Nov 14, 2024Locations: 1
Eligibility criteria

Males 18-89 who are undergoing HoLEP for the treatment of bothersome lower urina...

Prostates measurements over 200g [+2]

Status: Recruiting

Development of a New Canadian Endourology Group Stent Symptom Score

Placement of a ureteral stent is a common urological intervention. For decades there was no valid measures available to assess quality of life issues in patients with ureteral stents, which has hampered the understanding of such symptoms and their true impact. In order to improve the outcomes associated with the placement of a stent, a validated tool is needed to measure its impact and the amount of undesirable effects it produces on patients requiring the placement of a stent. In 2003, the team of the Bristol Urological Institute developed a validated questionnaire called the: URETERAL STENT SYMPTOM QUESTIONNAIRE (USSQ). The questionnaire contains 38 items included in 6 sections. Despite the obvious need of a validated questionnaire, the latter remains unused by the community of peer urologists. Many of urologists consider it too long to be used in clinical practice and even for research purposes. This issue motivated the Canadian Endourology Group (CEG) to work collaboratively on the development of the CANADIAN ENDOUROLOGY GROUP STENT SYMPTOM SCORE (CEGSSS) in order to provide clinicians with a more useful and validated tool. To fulfill this objective, the CEG proceeds in three phases. Phase 1. A systematic, deliberative, and participatory approach mostly through face to face meetings, including patients, clinicians, and researchers in the field of Endourology to identify a minimum needs-based set of domains and items that are, clinically relevant to be included in the CEGSSS in order to ensure optimal uptake in the clinical setting. Phase 2. A pilot study to assess feasibility/acceptability and further refine the proposed set of items selected in phase 1 of the study. Phase 3. A multicentric prospective study to evaluate the validity, reliability and sensitivity to change of the CEGSSS. This research project is conducted by the Canadian Endourology Group (CEG), a panel of experts in the field of endourology in Canada. The CEG is a national member-based organization dedicated to enabling the profession to provide the highest possible standards of endourological care and to advance the science of endourology by collaboratively: 1. Fostering excellence in endourological practice through advocacy, education, research and practice support tools, 2. Leading evidence-based clinical practice through the development of practice standards and guidelines in endourology, 3. Providing continuous professional development for Canadian endourologists along the career-path continuum, 4. Providing leadership in public education for endourological conditions.

Participants needed: 180
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: Centre hospitalier de l'Université de Montréal (CHUM)Updated: Jun 7, 2024Locations: 9
Eligibility criteria

Age ≥ 18 years [+2]

Inability to provide an informed consent due to physical or mental inability [+3]

Status: Recruiting

PROM Project Urology

All patients undergoing urological surgery or treatment should receive standardized questionnaires on quality of life, satisfaction, pain and physical recovery. Indication-specific, individual pathways are set up, for example, for patients with localized prostate cancer, benign prostate enlargement, bladder dysfunction or erectile dysfunction. In combination with the clinical data, the PROM data should help to improve the quality of the results and, if necessary, adapt treatment pathways to patient needs.

Participants needed: 47
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: Medical University of GrazUpdated: May 2, 2024Locations: 1
Eligibility criteria

Patients treated at the Department of Urology [+3]

Status: Recruiting

The Man Van Project

National Health Service (NHS) England has commissioned The Royal Marsden Hospital NHS Foundation Trust to run a novel mobile clinical outreach service called 'Man Van' with the aim of enabling male patients' easy access to care at the site of their work and in their communities. The initial focus of this new standard of care clinic is to access workplaces with large manual workforces where large scale working from home is not possible. These will include logistics firms and bus companies. These companies employ large numbers of black and minority ethnic men who also have poorer outcomes with a range of other diseases, including Coronavirus disease (COVID)-19. The novel clinical service will collaborate with Unite (and other unions) as well as employers in order to reach our target groups effectively. There is also the opportunity to target higher risk groups e.g. Afro Caribbean communities whose rates of prostate cancer are 1 in 41 as well as occupational higher risk categories. The Man Van has the potential to swing the balance of evidence in favour of Prostate-Specific Antigen (PSA) screening, with a targeted screening program directed at high-risk groups including ethnic minorities and manual workers. Reasons for poorer outcomes amongst these groups are multi-factorial and complex. Levels of education are often a factor which can impact the understanding of the disease and how to seek assistance. Distrust of medical organisations has also been cited as a factor. The aim of the Man Van mobile outreach service is to enable men access to a specific men's health service - focusing on general health and wellbeing (including BMI assessment, blood pressure, blood sugar/diabetes checks etc) and a prostate check for those who raise concerns. This will include a PSA test where relevant. This will be the core data gathered from the project. Patients will receive PSA results in the 'Man Van' by a clinical nurse specialist with patients with raised PSA levels being referred into the standard rapid referral cancer pathways. Similar considerations will apply to men with haematuria detected on dip stick testing or who present with a testicular mass or penile lesion (both rare but important). The clinical data generated from each routine health screening appointment will be analysed to determine the effectiveness of the Man Van mobile outreach model in identifying prostate and other male cancers and other co-morbidities much earlier than if patients had waited to present to their General Practitioner (GP) or other healthcare provider. Patients who receive an early diagnosis of clinically significant prostate cancer will have access to early curative treatments, which are typically less invasive and shorter in timescales. Similar interventions have shown large scale success in particular with breast and cervical cancer. The NHS sees many patients accessing cancer care at a late stage. Reducing this trend is a key objective of the NHS Long Term Plan. The COVID-19 pandemic has further exacerbated health inequalities and mobile clinics can potentially be a model for alleviating this. To enable patients access to medical treatment earlier there is a need to make the 'seeking advice on men's health and prostate issues' less daunting, more normal and easily accessible. The 'Man Van' has the ability to do just that and it is anticipated that the findings of this research, using the data generated from each patient's routine health screening, will demonstrate that a mobile outreach model is more effective in identifying cancers at an earlier stage than 'traditional' diagnostic pathways. We also hope to evaluate the Man Van with a qualitative study looking at the patient perspectives from those who utilise the Man Van. The reasons for high risk in prostate cancer are heavily linked to genetics. This is an issue as there is less recruitment of high risk groups to studies. We hope to gather genetic data from a higher proportion of genetically susceptible men via the Man Van, which can be used in future to further genetic knowledge of prostate cancer.

Participants needed: 4,000
Trial details
Age: 18+Biological sex: MaleType: InterventionalSponsor: Royal Marsden NHS Foundation TrustUpdated: May 1, 2024Locations: 1
Eligibility criteria

Participating in the linked Man Van mobile outreach clinic [+23]

Status: Recruiting

Bank of Biological Material From Patients and Healthy Donors for the Study of Urological and Uro-oncological Pathologies

The project aims to collect fresh biological material derived both from surgical resections performed in diseases, neoplastic and otherwise, of urological relevance at the level of the prostate, bladder, kidney, testicle and genitourinary organs, and from peripheral blood or other fluids biological samples such as urine, seminal fluid, buccal mucosa, feces or saliva, when available.

Participants needed: 15,000
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: IRCCS San RaffaeleUpdated: Jan 10, 2024Locations: 1
Eligibility criteria

Male and female patients with an age > 18 [+2]

People with an age < 18 [+1]

Status: Recruiting

Protocol N. 2014 - Observational Study on the Quality of Life of Outpatients

Prospective observational study on the quality of life of patients attending general urology, sexual medicine, reproductive medicine, functional urology, neuro-urology and uro-oncology clinics.The data relating to the clinical conditions (disease state, psychological and related to quality of life) of the patients belonging to the above-mentioned clinics will be collected in a specially designed database which will allow us to extract the data in a simple and safe way used for statistical analyses. in clinical research.

Participants needed: 10,000
Trial details
Age: 18+Biological sex: MaleType: ObservationalSponsor: IRCCS San RaffaeleUpdated: Jan 5, 2024Locations: 1
Eligibility criteria

subjects belonging to general urology, sexual medicine, reproductive medicine, f... [+2]

- subjects < 18 years [+1]

Status: Recruiting

Quality and Outcome Measurements of Urological Patients

Prospectively, all available parameters of urologic patients treated at the study sites will be acquired and stored in multilayered databases. Upon a given samples size, neuronal networks will be trained to define clinical endpoints. Beside uro-oncological patients also patients with other urological diseases will be enrolled.

Participants needed: 2,000
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: Insel Gruppe AG, University Hospital BernUpdated: Mar 10, 2023Locations: 2
Eligibility criteria

All patients treated at the study sites, signed informed consent

No consent to record medical history

Status: Recruiting

Canadian Cohort of Convective Thermal Therapy Using Rezūm System in Benign Prostatic Hyperplasia (BPH).

To document the clinical outcome of Rezūm therapy for BPH patient in Canadian cohort.

Participants needed: 50
Trial details
Age: 18+Biological sex: MaleType: ObservationalSponsor: Can-Am HIFU Inc.Updated: Jan 21, 2022Locations: 1
Eligibility criteria

Male subjects of ≥ 18 years of age. [+4]

Characteristics indicating a poor compliance with study protocol requirements. [+2]

Status: Recruiting

Aquablation in Benign Prostatic Hyperplasia in Canada

To document the clinical outcome of Aquablation therapy for BPH patient in Canadian cohort.

Participants needed: 25
Trial details
Age: 18+Biological sex: MaleType: ObservationalSponsor: Can-Am HIFU Inc.Updated: Dec 27, 2021Locations: 1
Eligibility criteria

Primary diagnosis of Benign Prostate Hypertrophy (BPH) [+4]

Characteristics indicating a poor compliance with study protocol requirements. [+2]

Status: Not yet recruiting

Safety and Clinical Outcomes With Amniotic and Umbilical Cord Tissue Therapy for Numerous Medical Conditions

To determine the safety and efficacy of Amniotic and Umbilical Cord Tissue for the treatment of the following condition categories: Orthopedic, Neurologic, Urologic, Autoimmune, Renal, Cardiac and Pulmonary Conditions. The hypotheses are that the treatments are not only extremely safe, but also statistically beneficial for all conditions. Outcomes will be determined by numerous valid outcome instruments that compile general quality of life information along with condition-specific information as well.

Participants needed: 5,000
Trial details
Phase: Phase 1Age: 18+Biological sex: AllType: InterventionalSponsor: R3 Stem CellUpdated: Aug 22, 2019
Eligibility criteria

Age 18 and over. [+3]

Active Cancer [+3]