1. Department of Epidemiology, Brown University School of Public Health, Providence, Rhode Island, USA
2. Centers for Disease Control and Prevention, National Center for Environmental Health, Atlanta, Georgia, USA
3. Department of Environmental Health, University of Cincinnati, Cincinnati, Ohio, USA
4. Faculty of Health and Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
5. Child and Family Research Institute, BC Children’s and Women’s Hospital, Vancouver, British Columbia, Canada
6. Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, Cincinnati, Ohio, USA