With an estimated sample size of 350 patients treated with Artificial Urethral Sphincter (AUS) and 150 patients with a male sling, and taking into account an attrition rate of 10-15%, we will be able to detect a 50% cure rate with 6% on either side of the 95% Confidence Interval for AUS (proportion 0,50 with 95% Confidence Intervals: 0,44-0,56) and a 65% cure rate for patients treated with male slings (proportion 0,65 with 95% Confidence Intervals: 0,57-0,74).