Hospital stay: length (days) of hospital stay after surgery Intra-operative time: minutes between skin incision and end of skin closure Conversion "Single-Port (SPC) to Multi-Ports (4PC) Laparoscopy" rate: number of cases in which the surgeon preferred conversion from SPC to 4PC for safely of technical reasons Conversion "to Open Surgery" rate: number of cases in which the surgeon preferred conversion from SPC or 4PC to laparotomy for safely or technical reasons.