1. Departments of Dental Public Health and Pediatric Dentistry, School of Dental Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
2. School of Dental Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
3. Division of Pediatric and Public Health, Adams School of Dentistry University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
4. Department of Epidemiology, Gillings School of Global Public Health University of North Carolina Chapel Hill North Carolina USA