[1] Kyoto Univ, Dept Surg, Grad Sch Med, 54 Shogoin Kawahara Cho,Sakyo Ku, Kyoto 6068507, Japan
[2] Hokkaido Univ, Fac Med, Dept Gastroenterol Surg 2, Sapporo, Japan
[3] Indiana Univ, Sch Med, Dept Surg, Indianapolis, IN USA
[4] Kansai Med Univ, Dept Surg, Osaka, Japan
[5] Yokohama City Univ, Dept Gastroenterol Surg, Grad Sch Med, Yokohama, Japan
[6] Nagasaki Univ, Dept Surg, Grad Sch Biomed Sci, Nagasaki, Japan
[7] Kumamoto Univ, Dept Cardiovasc Surg, Kumamoto, Japan
[8] Tokyo Med Univ, Dept Surg, Tokyo, Japan
[9] Kyushu Univ, Grad Sch Med Sci, Dept Pediat Surg, Fukuoka, Japan
[10] Tohoku Med & Pharmaceut Univ, Div Cardiovasc Surg, Sendai, Japan
[11] Tokyo Med & Dent Univ Hosp, Trauma & Acute Crit Care Ctr, Tokyo, Japan
[12] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Oncol, Fukuoka, Japan
[13] Nagoya Univ, Dept Gastroenterol Surg, Grad Sch Med, Nagoya, Japan
[14] Juntendo Univ, Div Med Educ, Sch Med, Tokyo, Japan
[15] Kyoto Univ, Grad Sch Med, Dept Breast Surg, Kyoto, Japan
[16] Wakayama Med Univ, Dept Surg 2, Wakayama, Japan
[17] Int Univ Hlth & Welf, Grad Sch Med, Dept Med Educ, Narita, Japan
[18] Int Univ Hlth, Dept Thorac Surg, Narita, Japan
[19] Welf Sch Med, Narita, Japan
[20] Juntendo Univ, Dept Breast Oncol, Sch Med, Tokyo, Japan