1. Departments of Preventive and Restorative Dentistry and Oral and Craniofacial Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
2. Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region, China
3. Faculty of Dentistry, Department of Periodontics and Implant Dentistry, Thammasat University, Pathum Thani, Thailand