1. Chung Shan Medical University Institute of Medicine, , Taichung, Taiwan
2. Chung Shan Medical University School of Medicine, , Taichung, Taiwan
3. Chung Shan Medical University Hospital Department of Family and Community Medicine, , Taichung, Taiwan
4. Chung Shan Medical University Hospital Department of Geriatric Medicine, , Taichung, Taiwan
5. Chung Shan Medical University Hospital Department of Occupational Medicine, , Taichung, Taiwan