[1] Univ Ulsan, Coll Med, Div Hepatobiliary Surg & Liver Transplantat, Asan Med Ctr, Seoul 138736, South Korea
[2] Univ Ulsan, Coll Med, Dept Surg, Asan Med Ctr, Seoul 138736, South Korea
[3] Univ Ulsan, Coll Med, Asan Inst Life Sci, Asan Med Ctr, Seoul 138736, South Korea