1. Department of Epidemiology; Mailman School of Public Health; Columbia University; New York NY USA
2. Division of Periodontics; Section of Oral and Diagnostic Sciences; College of Dental Medicine; Columbia University; New York NY USA
3. Division of Molecular Genetics; Departments of Pediatrics and Medicine; Columbia University; New York NY USA
4. Division of Epidemiology and Community Health; School of Public Health; University of Minnesota; Minneapolis MN USA
5. Department of Nutrition; University of Oslo; Oslo Norway
6. Centre de recherche Epidémiologies et Biostatistique; INSERM U1153 Equipe: Méthodes en évaluation thérapeutique des maladies chroniques; Paris France