1. Department of Family and Community Medicine, Division of Family Medicine, Tri-Service General Hospital and School of Medicine, National Defense Medical Center, Taipei, Taiwan, Republic of China
2. Department of Community Medicine, Division of Family Medicine, Taoyuan Armed Forces General Hospital, Taoyuan, Taiwan, Republic of China
3. Department of Family and Community Medicine, Division of Geriatric Medicine, Tri-Service General Hospital and School of Medicine, National Defense Medical Center, Taipei, Taiwan, Republic of China
4. Graduate Institute of Clinical Medical, College of Medicine, National Taiwan University, Taipei, Taiwan, Republic of China
5. Department of Otolaryngology-Head and Neck Surgery, Tri-Service General Hospital, and School of Medicine, National Defense Medical Center, Taipei, Taiwan, Republic of China
6. Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan, Republic of China