1. Chung Shan Medical University Hospital Division of Infectious Diseases, Department of Internal Medicine, , Taichung 402306, Taiwan
2. School of Medicine, Chung Shan Medical University , Taichung 402306, Taiwan
3. Chung Shan Medical University Hospital Department of Medical Research, , Taichung 402306, Taiwan
4. Chung Shan Medical University Institute of Medicine, , Taichung 402306, Taiwan
5. Chung Shan Medical University School of Medicine, , Taichung 402306, Taiwan
6. Chung Shan Medical University Hospital Department of Family and Community Medicine, , Taichung 402306, Taiwan
7. Department of Occupational Medicine, Chung Shan Medical University Hospital , Taichung 402306, Taiwan