1. Department of Family Medicine School of Medicine College of Medicine Kaohsiung Medical University Kaohsiung Taiwan
2. Department of Family Medicine Kaohsiung Medical University Hospital Kaohsiung Medical University Kaohsiung Taiwan
3. Department of Family Medicine Kaohsiung Municipal Ta‐Tung Hospital Kaohsiung Medical University Hospital Kaohsiung Medical University Kaohsiung Taiwan
4. Department of Neurology Kaohsiung Medical University Hospital Kaohsiung Taiwan
5. Department of Neurology Pingtung Hospital Ministry of Health and Welfare Pingtung Taiwan
6. Department of Family Medicine Kaohsiung Municipal Hsiao‐Kang Hospital Kaohsiung Medical University Kaohsiung Taiwan
7. Department of Public Health Kaohsiung Medical University Kaohsiung Taiwan
8. Center of Environmental and Occupational Medicine Kaohsiung Municipal Hsiao‐Kang Hospital Kaohsiung Medical University Kaohsiung Taiwan
9. Department of Otorhinolaryngology School of Medicine College of Medicine Kaohsiung Medical University Kaohsiung Taiwan
10. Department of Otorhinolaryngology Kaohsiung Medical University Hospital Kaohsiung Medical University Kaohsiung Taiwan
11. Department of Otorhinolaryngology Kaohsiung Municipal Hsiao‐Kang Hospital Kaohsiung Medical University Kaohsiung Taiwan