[1] Kyoto Univ, Dept Surg, Kyoto, Japan
[2] Japanese Red Cross Wakayama Med Ctr, Dept Surg, Wakayama, Japan
[3] Natl Hosp Org Kyoto Med Ctr, Dept Surg, Kyoto, Japan
[4] Himeji Med Ctr, Dept Gastroenterol Surg & Oncol, Himeji, Hyogo, Japan
[5] Toyooka Hosp, Dept Surg, Toyooka, Japan
[6] Osaka Red Cross Hosp, Osaka, Japan
[7] Shiga Gen Hosp, Dept Surg, Moriyama, Japan
[8] Kyoto City Hosp, Dept Surg, Kyoto, Japan
[9] Kyoto Katsura Hosp, Dept Surg, Kyoto, Japan
[10] Kobe City Nishi Kobe Med Ctr, Dept Surg, Kobe, Hyogo, Japan
[11] Kobe City Med Ctr West Hosp, Dept Surg, Kobe, Hyogo, Japan
[12] Osaka Saiseikai Noe Hosp, Gastroenterol Surg, Osaka, Japan
[13] Otsu City Hosp, Dept Surg, Otsu, Shiga, Japan
[14] Osaka Red Cross Hosp, Osaka, Japan