1. Epidemiology and Biostatistics CoreThe Forsyth InstituteCambridgeMassachusettsU.S.A.
2. Department of Oral Health Policy and EpidemiologyHarvard School of Dental MedicineBostonMassachusettsU.S.A.
3. Centre INSERM U‐897‐Epidemiologie‐BiostatistiqueINSERMBordeauxFrance
4. Department of BiostatisticsHarvard T. H. Chan School of Public HealthBostonMassachusettsU.S.A.