[1] Kaohsiung Chang Gung Mem Hosp, Div Hepatogastroenterol, Gastrointestinal Motil Unit, Kaohsiung 833, Taiwan
[2] Chang Gung Univ, Coll Med, Kaohsiung 833, Taiwan
[3] Kaohsiung Chang Gung Mem Hosp, Dept Med, Div Gen Med, Kaohsiung 833, Taiwan
[4] Kaohsiung Chang Gung Mem Hosp, Div Thorac & Cardiovasc Surg, Kaohsiung 833, Taiwan
[5] Show Chwan Mem Hosp, Dept Med Res, Ctr Digest Dis, Changhua 500, Taiwan
[6] Natl Taiwan Univ Hosp, Grad Inst Clin Med, Dept Internal Med, Taipei 100, Taiwan
[7] Natl Taiwan Univ, Coll Med, Taipei 100, Taiwan