[1] Pusan Natl Univ Hosp, Dept Pathol, Pusan 602739, South Korea
[2] Pusan Natl Univ, Sch Med, Pusan 602739, South Korea
[3] Pusan Natl Univ Hosp, Biomed Res Inst, Pusan 602739, South Korea
[4] Pusan Natl Univ Hosp, Dept Surg, Pusan 602739, South Korea
[5] Pusan Natl Univ Hosp, Dept Gastroenterol, Pusan 602739, South Korea