[1] Yonsei Univ, Wonju Coll Med, Dept Internal Med, Wonju, South Korea
[2] Yonsei Univ, Wonju Coll Med, Dept Radiol, Wonju, South Korea
[3] Yonsei Univ, Wonju Coll Med, Dept Prevent Med, Wonju, South Korea
[4] Yonsei Univ, Wonju Coll Med, Inst Occupat Med, Wonju, South Korea
[5] Univ Calgary, Liver Unit, Calgary, AB, Canada