1. Division of Family Medicine, Department of Family and Community Medicine, Tri-Service General Hospital and School of Medicine, National Defense Medical Center, No. 325, Section 2, Chenggong Road, Neihu District, Taipei City 114, Taiwan
2. Division of Geriatric Medicine, Department of Family and Community Medicine, Tri-Service General Hospital and School of Medicine, National Defense Medical Center, No. 325, Section 2, Chenggong Road, Neihu District,Taipei City 114, Taiwan
3. Graduate Institute of Medical Sciences, National Defense Medical Center, No. 161, Section 6, Minquan E. Road, Neihu District, Taipei City 114, Taiwan
4. Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung, Taiwan