1. Department of Pediatrics, Skåne University Hospital, Lund University, Malmö, Sweden
2. Pediatric Epidemiology Center, University of South Florida, Tampa, Florida
3. Department of Epidemiology, Wake Forrest University, Winston-Salem, North Carolina
4. Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado
5. Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio
6. Department of Pediatrics, University of Washington, Seattle, Washington
7. Children’s Hospital, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland
8. Folkhälsan Research Center, Helsinki, Finland
9. Department of Pediatrics, Tampere University Hospital, Tampere, Finland
10. Department of Pediatrics, University of Oulu, Oulu, Finland
11. Department of Pediatrics, The Sahlgrenska Academy at University of Gothenburg, Göteborg, Sweden
12. Department of Health and Environment, Linköping University, Linköping, Sweden
13. Institute of Epidemiology, University of Ulm, Ulm, Germany
14. Department of Pediatrics, University of Florida, Gainesville, Florida