1. Clinical Periodontics; School of Dentistry; College of Oral Medicine; Taipei Medical University; Taipei Taiwan
2. Clinical Periodontics of Dental Department; Taipei Medical University Hospital; Taipei Taiwan
3. Institute of Epidemiology and Preventive Medicine; College of Public Health; National Taiwan University; Taipei Taiwan
4. Division of Periodontics; Department of Dentistry; Changhua Christian Hospital; Changhua Taiwan