1. Department of Preventive Medicine and Public Health Universidade de Santiago de Compostela Santiago de Compostela Spain
2. CIBEResp Madrid Spain
3. Department of Pediatrics, Cincinnati Children's Hospital Medical Center University of Cincinnati College of Medicine Cincinnati Ohio USA
4. Faculty of Health Sciences Simon Fraser University Vancouver British Columbia Canada
5. Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
6. Department of Environmental Health and Engineering Johns Hopkins University Bloomberg School of Public Health Baltimore Maryland USA
7. Department of Pediatrics, Division of Gastroenterology, Hepatology & Nutrition, Cincinnati Children's Hospital Medical Center University of Cincinnati College of Medicine Cincinnati Ohio USA
8. Department of Radiology, Cincinnati Children's Hospital Medical Center University of Cincinnati College of Medicine Cincinnati Ohio USA
9. Department of Epidemiology Brown University Providence Rhode Island USA