1. Geriatric Medicine Center; Kaohsiung Veterans General Hospital; Kaohsiung Taiwan
2. Division of Neurology, Department of Internal Medicine; Kaohsiung Veterans General Hospital; Kaohsiung Taiwan
3. National Yang Ming University School of Medicine; Taipei Taiwan
4. Department of Family Medicine; Kaohsiung Veterans General Hospital; Kaohsiung Taiwan
5. Department of Emergency Medicine; Kaohsiung Veterans General Hospital; Kaohsiung Taiwan
6. Center for Geriatrics and Gerontology; Taipei Veterans General Hospital; Taipei Taiwan