[1] Tohoku Univ, Grad Sch Med, Dept Surg, Sendai, Japan
[2] Univ Toyama, Fac Med, Dept Surg & Sci, Acad Assembly, 2630 Sugitani, Toyama 9300194, Japan
[3] Mie Univ Hosp, Dept Hepatobiliary Pancreat & Transplant Surg, Tsu, Japan
[4] Kansai Med Univ, Dept Surg, Hirakata, Japan
[5] Kanagawa Canc Ctr, Dept Gastroenterol, Yokohama, Japan
[6] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Oncol, Fukuoka, Japan
[7] Chiba Univ, Grad Sch Med, Dept Gen Surg, Chiba, Japan
[8] Mie Univ Hosp, Dept Pathol, Tsu, Japan
[9] St Marianna Univ, Sch Med, Dept Pathol, Kawasaki, Japan
[10] Keio Univ, Sch Med, Div Diagnost Pathol, Tokyo, Japan
[11] Tohoku Univ, Grad Sch Med, Dept Invest Pathol, Sendai, Japan
[12] Univ Toyama, Fac Med, Dept Diagnost Pathol, Acad Assembly, Toyama, Japan
[13] Jichi Med Univ, Dept Pathol, Shimotsuke, Japan
[14] Tokyo Metropolitan Univ, Grad Sch Human Hlth Sci, Dept Frontier Hlth Sci, Tokyo, Japan
[15] Juntendo Univ, Grad Sch Med, Dept Gastroenterol, Tokyo, Japan
[16] Tokyo Med Univ, Dept Gastroenterol & Hepatol, Tokyo, Japan
[17] Kagoshima Univ, Grad Sch Med & Dent Sci, Dept Digest Surg, Kagoshima, Japan
[18] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan
[19] Kanazawa Univ, Grad Sch Med Sci, Dept Radiol, Ishikawa, Kanazawa, Japan
[20] Kurashiki Cent Hosp, Dept Surg, Kurashiki, Japan
[21] Nagahama City Hosp, Dept Surg, Nagahama, Japan
[22] Shiga Univ Med Sci, Dept Surg, Otsu, Japan
[23] Tokyo Med Univ, Dept Gastrointestinal & Pediat Surg, Tokyo, Japan
[24] Dokkyo Med Univ, Saitama Med Ctr, Dept Surg, Koshigaya, Japan
[25] Kinki Univ, Sch Med, Dept Surg, Osakasayama, Japan