1. Division of Restorative and Aesthetic Dentistry, Dental Department, National Taiwan University Hospital, Taipei, Taiwan
2. Department of Dentistry, School of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan
3. Department of Dentistry, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu City, Taiwan
4. Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University and National University Hospital, Taipei, Taiwan