2994651 RS-RARP Retzius-sparing robot-assisted radical prostatectomy 63 2994654 RS-RARP Retzius-sparing RARP 7 2994653 RS-RARP Retzius-sparing approach 3 2994656 RS-RARP result in positive surgical margins more often than C-RARP 1 2994652 RS-RARP Retzius-sparing radical prostatectomy 1 2994655 RS-RARP robot assisted laparoscopic radical prostatectomy 1