1. School of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
2. Department of Family and Community Medicine, Chung Shan Medical University Hospital, Taichung 402, Taiwan
3. Institute of Oral Sciences, Chung Shan Medical University, Taichung 402, Taiwan
4. Department of Dentistry, Chung Shan Medical University Hospital, Taichung 402, Taiwan
5. Department of Ophthalmology, Nobel Eye Institute, Taipei 115, Taiwan
6. Department of Ophthalmology, Jen-Ai Hospital Dali Branch, Taichung 412, Taiwan
7. Institute of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
8. Department of Medical Research, Chung Shan Medical University Hospital, Taichung 402, Taiwan
9. Oral Cancer Research Center, Changhua Christian Hospital, Changhua 500, Taiwan
10. Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung 402, Taiwan
11. Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan