[1] Korea Univ, Guro Hosp, Div Hepatobiliary Pancreat Surg, Dept Surg,Med Coll, Seoul, South Korea
[2] Univ Ulsan, Div Hepatobiliary & Liver Transplantat, Dept Surg, Asan Med Ctr,Coll Med, 88 Olymp Ro,43 Gil, Seoul 05505, South Korea
[3] Univ Ulsan, Div Pediat Surg, Dept Surg, Asan Med Ctr,Coll Med, Seoul, South Korea
[4] Inje Univ, Haeundae Paik Hosp, Dept Surg, Coll Med, Busan, South Korea