[1] Yonsei Univ, Dept Prevent Med, Coll Med, Seoul, South Korea
[2] Yonsei Univ, Dept Internal Med, Coll Med, 50-1 Yonsei Ro, Seoul 03722, South Korea
[3] Yonsei Univ, Inst Gastroenterol, Coll Med, Seoul, South Korea
[4] Yonsei Univ Hlth Syst, Severance Hosp, Yonsei Liver Ctr, Seoul, South Korea
[5] Yonsei Univ, Grad Sch, Dept Publ Hlth, Coll Med, Seoul, South Korea
[6] Yonsei Univ, Dept Occupat Hlth, Dept Prevent Med, Coll Med, 50-1 Yonsei Ro, Seoul 03722, South Korea