1. QC Dental Clinic; Taipei Taiwan
2. Department of Dentistry; National Yang-Ming University; Taipei Taiwan
3. School of Dentistry; College of Oral Medicine; Taipei Medical University; Taipei Taiwan
4. Graduate Institute of Epidemiology and Preventive Medicine; College of Public Health; National Taiwan University; Taipei Taiwan
5. School of Oral Hygiene; College of Oral Medicine; Taipei Medical University; Taipei Taiwan
6. Oral Health Care Research Center; College of Oral Medicine; Taipei Medical University; Taipei Taiwan
7. Department and Graduate Institute of Health Care Management; College of Management; Chang Gung University; Tao-Yuan Taiwan
8. Department of Health Industry Management; Kainan University; Tao-Yuan Taiwan