[1] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Internal Med, Seoul 138736, South Korea
[2] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Pathol, Seoul 138736, South Korea
[3] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Hepatobiliary & Pancreat Surg, Seoul 138736, South Korea
[4] Univ Inje, Coll Med, Sanggye Paik Hosp, Dept Internal Med, Seoul, South Korea
[5] Hallym Univ, Coll Med, Kangdong Sacred Heart Hosp, Dept Internal Med, Seoul, South Korea