[1] Chonbuk Natl Univ, Sch Med & Hosp, Res Inst Clin Med,Brain Korea Program Med Sci 21, Dept Internal Med,Div Gastroenterol & Hepatol, Jeonju 561172, Jeonbuk, South Korea
[2] Seoul Natl Univ, Coll Med, Dept Pathol, Seoul, South Korea
[3] Chonbuk Natl Univ, Sch Med & Hosp, Res Inst Clin Med,Brain Korea Program Med Sci 21, Dept Pathol,Div Gastroenterol & Hepatol, Jeonju 561172, Jeonbuk, South Korea
[4] Chonbuk Natl Univ, Sch Med & Hosp, Res Inst Clin Med,Brain Korea Program Med Sci 21, Dept Surg,Div Gastroenterol & Hepatol, Jeonju 561172, Jeonbuk, South Korea