1. Department of Surgery, Toyonaka Municipal Hospital, Osaka, Japan; Department of Surgery, Sakai Municipal Hospital, Osaka, Japan; Department of Gastroenterological Surgery, Osaka University Graduate School of Medicine, Osaka, Japan; Osaka National Hospital, Osaka, Japan; Department of Surgery, Osaka Medical Center for Cancer and Cardiovascular Disease, Osaka, Japan; Kinki Central Hospital Itami, Itami, Japan; Department of Surgery, NTT West Osaka Hospital, Osaka, Japan; Department of Surgery, Hyogo...