1. Department of Epidemiology, School of Public Health, University of Washington, Seattle, Washington, USA
2. Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
3. Department of Biostatistics, and
4. Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington, USA
5. Department of Pediatrics, School of Medicine, University of Washington, Seattle, Washington, USA
6. Seattle Children’s Research Institute, Seattle, Washington, USA
7. Group Health Research Institute, Seattle, Washington, USA
8. Emory University, Rollins School of Public Health, Atlanta, Georgia, USA