1. Periodontology and Dental Public Health; Faculty of Dentistry; The University of Hong Kong; Hong Kong SAR China
2. Faculty of Dentistry; Universiti Sains Islam Malaysia; Kuala Lumpur Malaysia
3. Department of Medical Rehabilitation; Hospital Serdang; Kajang Selangor Malaysia
4. Department of Oral & Craniofacial Sciences; Faculty of Dentistry; University of Malaya; Kuala Lumpur Malaysia
5. Oral Rehabilitation; Faculty of Dentistry; The University of Hong Kong; Hong Kong SAR China
6. Tung Wah Hospital; Sheung Wan Hong Kong SAR China