1. Department of Epidemiology; Mailman School of Public Health; Columbia University; New York NY USA
2. Division of Molecular Genetics; Departments of Pediatrics and Medicine; Columbia University; New York NY USA
3. Dalla Lana School of Public Health; University of Toronto; Toronto ON Canada
4. Department of Molecular Genetics; The Forsyth Institute; Cambridge MA USA
5. Department of Oral Medicine, Infection, and Immunity; Harvard School of Dental Medicine; Boston MA USA
6. Centre de recherche Epidémiologies et Biostatistique; INSERM U1153 Equipe: Méthodes en évaluation thérapeutique des maladies chroniques; Paris France
7. Division of Epidemiology and Community Health; School of Public Health; University of Minnesota; Minneapolis MN USA
8. Division of Periodontics; Section of Oral and Diagnostic Sciences; College of Dental Medicine; Columbia University; New York NY USA