Importance of the duodenal passage and pouch volume after total gastrectomy and reconstruction with the Ulm Pouch: Prospective randomized clinical study - Schwarz,A.; Büchler,M.; Usinger,K.; Rieger,H.; Glasbrenner,B.; Friess,H.; Kunz,R.; Beger,H.G. (World J Surg, 1996)