1. Department of Oral Health Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
2. Department of Child Dental Health, Obafemi Awolowo University, Ile-Ife 220282, Nigeria
3. Nigeria Institute of Medical Research, Yaba 101212, Nigeria
4. Community Oral Health Department, Tehran University of Medical Sciences, Teheran 1449614535, Iran
5. Faculty of Health Sciences, University of Zaragoza, 50009 Zaragoza, Spain
6. Department of Child Dental Health, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife 220282, Nigeria
7. Department of Preventive Dentistry, School of Dentistry, College of Medical Sciences, University of Benin, Benin City 300271, Nigeria
8. Department of Preventive Dentistry, Alexandria University, Alexandria 21527, Egypt