1. Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
2. Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia, Canada
3. Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Department of Radiology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
5. Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania Philadelphia, Pennsylvania, USA
6. Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
7. Department of Epidemiology, Brown University, Providence, Rhode Island, USA