1. Graduate Institute of Clinical Dentistry; National Taiwan University Medical College; Taipei Taiwan
2. Department of Dentistry; National Taiwan University Hospital; Taipei Taiwan
3. Biomedical Science Team; Chang Gung University of Science and Technology; Taoyuan Taiwan
4. Department of Dentistry; Chang Gung Memorial Hospital; Taipei Taiwan
5. Biostatistics Laboratory; College of Public Health; National Taiwan University; Taipei Taiwan
6. Department of Dentistry; Shin Kong Wu Ho-Su Memorial Hospital; Taipei Taiwan
7. Department of Dentistry; Taipei Medical University Hospital; Taipei Taiwan