[1] Yeungnam Univ, Coll Med, Dept Internal Med, Div Gastroenterol & Hepatol, Daegu, South Korea
[2] Kyungpook Natl Univ, Sch Med, Dept Internal Med, Div Gastroenterol & Hepatol, Daegu, South Korea
[3] Kyungpook Natl Univ, Dept Surg, Daegu, South Korea
[4] Kyungpook Natl Univ, Sch Med, Dept Biochem & Cell Biol, Daegu, South Korea
[5] Keimyung Univ, Sch Med, Dongsan Med Ctr, Dept Pathol, Daegu, South Korea