[1] Univ Ulsan, Asan Med Ctr, Dept Surg, Coll Med,Div Hepatobiliary & Pancreat Surg, Seoul, South Korea
[2] Seoul Natl Univ, Bundang Hosp, Dept Surg, 300 Gumi Dong, Seongnam Si 13620, Gyeonggi Do, South Korea
[3] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Hepatobiliary & Pancreat Surg,Dept Surg, Seoul, South Korea
[4] Tohoku Univ, Dept Surg, Sendai, Miyagi, Japan
[5] Kitasato Univ, Dept Gen Pediat & Lepatobiliary Pancreat Surg, Sch Med, Sagamihara, Kanagawa, Japan
[6] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Oncol, Fukuoka, Japan
[7] Komagome Hosp, Dept Hepatobiliary Pancreat Surg, Tokyo Metropolitan Canc & Infect Dis Ctr, Tokyo, Japan
[8] Tokyo Med & Dent Univ, Grad Sch Med, Dept Hepatobiliary & Pancreat Surg, Tokyo, Japan
[9] Yonsei Univ, Dept Surg, Div HBP Surg, Coll Med, Seoul, South Korea
[10] Seoul Natl Univ, Coll Med, Seoul Natl Univ Hosp, Dept Surg,Div Hepatobiliary & Pancreat Surg, Seoul, South Korea
[11] Catholic Univ Korea, Coll Med, Seoul St Marys Hosp, Div Hepatobiliary & Pancreas Surg,Dept Surg, Seoul, South Korea
[12] Yonsei Univ, Gangnam Severance Hosp, Dept Surg, Coll Med, Seoul, South Korea
[13] Chonnam Natl Univ Med Sch, Chonnam Natl Univ Hosp, Dept Surg, Div Hepatopancreatobiliary Surg, Gwangju, South Korea
[14] Gyeongsang Natl Univ, Coll Med, Gyeongsang Natl Univ Hosp, Dept Surg, Jinju, South Korea
[15] Kindai Univ, Fac Med, Dept Surg, Higashiosaka, Osaka, Japan
[16] Wakayama Med Univ, Dept Surg 2, Wakayama, Japan
[17] Chiba Univ, Grad Sch Med, Dept Gen Surg, Chiba, Japan
[18] Mie Univ, Hepatobiliary Pancreat & Transplant Surg, Grad Sch Med, Tsu, Mie, Japan
[19] Osaka Med & Pharmaceut Univ, Dcpartment Gen & Gastroenterol Surg, Takatsuki, Osaka, Japan
[20] Shinshu Univ, Dept Surg, Sch Med, Div Gastroenterol Hepatobiliary Pancreat Transpla, Matsumoto, Nagano, Japan
[21] Oita Univ, Dept Gastroenterol & Pediat Surg, Fac Med, Oita, Japan
[22] Nara Med Univ, Dept Surg, Kashihara, Nara, Japan
[23] Kansai Rosai Hosp, Amagasaki, Hyogo, Japan
[24] Univ Ulsan, Ulsan Univ Hosp, Coll Med, Dept Surg, Ulsan, South Korea
[25] Keimyung Univ, Dept Surg, Dongsan Hosp, Daegu, South Korea
[26] Asan Med Ctr, Dept Clin Epidemiol & Biostat, Seoul, South Korea
[27] Tokyo Womans Med Univ, Inst Gastroenterol, Dept Surg, Tokyo, Japan
[28] Yokohama City Univ, Dept Gastroenterol Surg, Yokohama, Kanagawa, Japan