1. Department of Periodontology School of Dentistry University of North Carolina at Chapel Hill Chapel Hill NC USA
2. Department of Applied Oral Sciences Forsyth Institute Cambridge MA USA
3. Department of Biostatistics Gillings School of Global Public Health University of North Carolina at Chapel Hill Chapel Hill NC USA
4. Department of Dental Ecology School of Dentistry University of North Carolina at Chapel Hill Chapel Hill NC USA
5. Department of Oral Health Policy and Epidemiology Harvard School of Dental Medicine Harvard University Boston MA USA
6. New York University College of Dentistry Bluestone Center for Clinical Research New York NY USA
7. Department of Oral Biology School of Dental Medicine State University of New York at Buffalo Buffalo NY USA
8. Section of Periodontics Department of Applied Dental Medicine Southern Illinois University School of Dental Medicine Alton IL USA
9. Department of Periodontics and Oral Medicine & Michigan Center for Oral Health Research University of Michigan School of Dentistry Ann Arbor MI USA
10. Rho Inc. Contract Research Organization Chapel Hill NC USA