1. Department of Public Health and Community Service, Tufts University School of Dental Medicine, Boston, USA
2. Department of Oral Medicine and Oral Surgery, School of Dentistry, University of Rwanda, Kigali, Rwanda
3. School of Public Health, University of Rwanda, Kigali, Rwanda
4. Department of Community and Preventive Dentistry, School of Dentistry, University of Rwanda, Kigali, Rwanda
5. Division of Biostatistics and Experimental Design, Tufts University School of Dental Medicine, Boston, USA
6. Department of Oral Health Policy and Epidemiology, Harvard School of Dental Medicine
7. School of Dentistry, University of Rwanda, Kigali, Rwanda
8. Department of Preventive and Community Dentistry, University of Rwanda School of Dentistry, Kigali, Rwanda