Laparoscopic colorectal anastomosis: risk of postoperative leakage. Results of a multicenter study. Laparoscopic Colorectal Surgery Study Group (LCSSG). - Köckerling,F.; Rose,J.; Schneider,C.; Scheidbach,H.; Scheuerlein,H.; Reymond,M.A.; Reck,T.; Konradt,J.; Bruch,H.P.; Zornig,C.; Barlehner,E.; Kuthe,A.; et al. (Surg Endosc, 1999)