1. Department of Family Medicine, Kaohsiung Veterans General Hospital, Kaohsiung City 81362, Taiwan
2. Department of Nursing, Meiho University, Pingtung City 912, Taiwan
3. Center for Geriatrics and Gerontology, Kaohsiung Veterans General Hospital, Kaohsiung City 81362, Taiwan
4. Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Veterans General Hospital, Kaohsiung City 81362, Taiwan