1. Departments of Dental Public Health and Pediatric Dentistry, School of Dental Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
2. Department of Oral Health Sciences University of Washington School of Dentistry Seattle Washington USA
3. Division of Cancer Control and Population Sciences National Cancer Institute Rockville Maryland USA
4. HealthPartners Institute Minneapolis Minnesota USA
5. Glasgow Dental School, School of Medicine, Dentistry and Nursing, College of Medical, Veterinary and Life Sciences University of Glasgow Glasgow UK
6. Department of Global Health University of Washington Seattle Washington USA