1. Department
of Epidemiology, Brown University, Providence, Rhode Island 02912, United States
2. Department
of Pediatrics, University of Washington, Seattle Children’s Research Institute, Seattle, Washington 98105, United States
3. Department
of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98195, United States
4. Division of Laboratory
Sciences, National Center for Environmental Health, Centers for Disease
Control and Prevention, Atlanta, Georgia 30341, United States
5. Department
of Pediatrics, Division of General and Community Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio 45229, United States
6. Child
and
Family Research Institute, BC Children’s Hospital and the Faculty
of Health Sciences, Simon Fraser University, Vancouver, British Columbia V5A 1S6, Canada