1. School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
2. Department of Dentistry, Chung Shan Medical University Hospital, Taichung, Taiwan
3. Oral Medicine Research Center, Chung Shan Medical University, Taichung, Taiwan
4. Department of Pathology, China Medical University Hospital, Taichung, Taiwan
5. Department of Pathology, China Medical University Beigang Hospital, Yunlin, Taiwan
6. Institute of Oral Sciences, Chung Shan Medical University, Taichung, Taiwan