[1] Chung Shan Med Univ, Inst Med, Taichung 40242, Taiwan
[2] Taichung Vet Gen Hosp, Div Gastroenterol, Dept Internal Med, Taichung 40242, Taiwan
[3] Chung Shan Med Univ, Dept Med, Taichung 40242, Taiwan
[4] Natl Cheng Kang Univ, Inst Gerontol, Tainan 70101, Taiwan
[5] Natl Cheng Kang Univ Hosp, Div Geriatr, Dept Internal Med, Tainan 70101, Taiwan
[6] Natl Cheng Kang Univ Hosp, Dept Internal Med, Div Gastroenterol, Tainan 70101, Taiwan