Departments of aEpidemiology and 2bMaternal and Child Health, University of North Carolina at Chapel Hill, cEpidemiology Branch, National Institute of Environmental Health Sciences, Department of Health and Human Services, Research Triangle Park, NC, dMPH Program, Department of Family and Community Medicine, University of New Mexico, Albuquerque, NM, USA, eDepartment of Paediatric Dentistry, University of Bristol Dental School, and fDepartment of Community-Based Medicine, University of Bristol, Bristol, UK
Correspondence: Dr J. Daniels, MPH, PhD, Department of Epidemiology, CB#7435, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7435, USA. E-mail: [email protected]
