1. School of Dentistry; College of Oral Medicine; Chung Shan Medical University; Taichung Taiwan
2. Department of Dentistry; Oral Medicine Center; Chung Shan Medical University Hospital; Taichung Taiwan
3. Graduate Institute of Oral Biology; School of Dentistry; National Taiwan University; Taipei Taiwan
4. Graduate Institute of Clinical Dentistry; School of Dentistry; National Taiwan University; Taipei Taiwan
5. Department of Dentistry; National Taiwan University Hospital; College of Medicine; National Taiwan University; Taipei Taiwan