Here is the design of a clinical trial:

Official Title: Effects of Transcutaneous Perineal Stimulation Versus Anal Stimulation on Urinary Incontinence After Radical Prostatectomy

Included conditions:
- Urinary Incontinence
- Radical Prostatectomy
- Pelvic Floor

Study Armgroups:
- {'label': 'Transcutaneous perineal stimulation', 'type': 'EXPERIMENTAL', 'description': 'Patient is asked to lie down with legs slightly bend and two adhesive electrodes are attached transcutaneous on base of penis and on perineum. Stimulation current is administrated half time with a fixed frequency of 30 Hz and half time with 50 Hz. Pulse increased until the patient perceives the current. Sessions lasted for 30 minutes weekly for 10 weeks.', 'interventionNames': ['Other: Transcutaneous perineal stimulation']}
- {'label': 'Anal stimulation', 'type': 'ACTIVE_COMPARATOR', 'description': 'Patient is asked to lie down with legs slightly bend and an electrical probe is inserted into the anus. Stimulation current is administrated half time with a fixed frequency of 30 Hz and half time with 50 Hz. Pulse increased until the patient perceives the current. Sessions lasted for 30 minutes weekly for 10 weeks.', 'interventionNames': ['Other: Anal stimulation']}

Interventions:
- {'type': 'OTHER', 'name': 'Transcutaneous perineal stimulation', 'description': 'Surface stimulation', 'armGroupLabels': ['Transcutaneous perineal stimulation']}
- {'type': 'OTHER', 'name': 'Anal stimulation', 'description': 'Intra-cavitary stimulation', 'armGroupLabels': ['Anal stimulation']}

Primary Outcomes:
- {'measure': 'Effects of transcutaneous perineal stimulation compared to anal stimulation', 'description': 'A change of the urine grams last in 24 hours', 'timeFrame': 'Baseline, 6 and 10 weeks'}

Please estimate the sample size based on the assumption: 
Alpha value of 5%, beta of 20% (power of 80%), and a 10% increase to account for losses to follow-up.
Sample size
        To estimate the sample size, we use the randomisation and online databases for clinical trials program of the online computer software Sealed Envelope Ltd. 2001â2015 (https://www.sealedenvelope.com/power/continuous-equivalence/).
        For this estimate, alpha values of 5% and beta of 20% (power of 80%) were taken into account. Based on data published in the literature [10, 12], and considering an expected difference in the 24-h Pad Test between the two studied groups of 22Â g, 32 patients are needed in each arm of the study. The interpretation is as follows: âif there is truly no difference between the control (ES by intra-anal probe) and intervention (ES by surface electrodes) treatment, then 64 patients are required to be 80% sure that the limits of a two-sided 90% confidence interval will exclude a difference in means of more than 22Â g".
        Assuming that there could be losses to follow-up, the number of individuals to be recruited will be increased by 10% until reaching 70 patients (35 patients per group).