1. Department of Periodontics and Oral Medicine; Michigan Center for Oral Health Research; University of Michigan; Ann Arbor MI USA
2. Colgate-Palmolive Technology Center; Piscataway NJ USA
3. Biostatistics Department; School of Public Health; University of Michigan; Ann Arbor MI USA
4. Department of Periodontology, School of Dentistry; University of North Carolina; Chapel Hill NC USA
5. Department of Applied Oral Sciences; The Forsyth Institute; Cambridge MA USA