Affiliation: | (1) Department of Surgery, Ichijo-dori Hospital, 1-1 Toyo-oka, Asahikawa, Hokkaido 078-8231, Japan;(2) Division of Digestive and General Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Niigata 951-8510, Japan |