[1] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Songnam 463707, Gyeonggi Do, South Korea
[2] Kosin Univ, Coll Med, Dept Internal Med, Pusan, South Korea
[3] Seoul Natl Univ, Coll Med, Dept Internal Med, Seoul 151, South Korea
[4] Seoul Natl Univ, Coll Med, Liver Res Inst, Seoul, South Korea
[5] Yonsei Univ, Wonju Coll Med, Dept Internal Med, Wonju, Gangwon Do, South Korea