[1] Taipei Vet Gen Hosp, Dept Med Res & Educ, Taipei 112, Taiwan
[2] Taipei Vet Gen Hosp, Div Gastroenterol, Dept Med, Taipei, Taiwan
[3] Natl Yang Ming Univ, Inst Clin Med, Sch Med, Taipei 112, Taiwan
[4] Natl Yang Ming Univ, Fac Med, Sch Med, Taipei 112, Taiwan
[5] Kaohsiung Med Univ Hosp, Dept Internal Med, Hepatobiliary Div, Coll Med, Kaohsiung, Taiwan
[6] Natl Taiwan Univ Hosp, Dept Internal Med, Taipei 10764, Taiwan
[7] Natl Taiwan Univ, Coll Med, Taipei 10764, Taiwan