1. Department of Preventive Dentistry-Periodontology; Faculty of Dentistry; Jazan University; Jazan Saudi Arabia
2. Department of Oral Biology & Biomedical Sciences (Periodontology); Faculty of Dentistry; University of Malaya; Kuala Lumpur Malaysia
3. Department of Community Oral Health & Clinical Prevention; Faculty of Dentistry; University of Malaya; Kuala Lumpur Malaysia