1. School of Dentistry, Chung Shan Medical University; Taichung Taiwan
2. Institute of Oral Sciences, Chung Shan Medical University; Taichung Taiwan
3. Department of Dentistry; Chung Shan Medical University Hospital; Taichung Taiwan
4. Institute of Biochemistry, Microbiology and Immunology; Chung Shan Medical University; Taichung Taiwan
5. Departmrnt of Living Services Industry; Tainan University of Technology; Tainan City Taiwan
6. Institute of Medicine, Chung Shan Medical University; Taichung Taiwan
7. Department of Medical Research; Chung Shan Medical University Hospital; Taichung Taiwan