1. Department of Dentistry, National Taiwan University Hospital, and School of Dentistry, National Taiwan University Medical College, Taipei, Taiwan
2. Chang Gung University of Science and Technology, Kwei-Shan, Taoyuan, Taiwan
3. Department of Dentistry, Chang Gung Memorial Hospital, Taipei, Taiwan
4. Department of Oral Hygiene Care, Ching Kuo Institute of Management and Health, Keelung, Taiwan
5. School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
6. Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan