1. Children’s Hospital of Philadelphia , Philadelphia, Pennsylvania , USA
2. Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania , USA
3. Duke University , Durham, North Carolina , USA
4. Department of Pathology, St Jude Children’s Research Hospital , Memphis, Tennessee , USA
5. Children’s Mercy and University of Missouri–Kansas City School of Medicine , Kansas City, Missouri , USA
6. Medical College of Wisconsin and Children’s Wisconsin , Milwaukee, Wisconsin , USA
7. Cincinnati Children’s Hospital Medical Center , Cincinnati, Ohio , USA
8. Northwestern University Feinberg School of Medicine , Chicago, Illinois , USA
9. Infectious Disease Unit, 3rd Department of Pediatrics, School of Medicine, Aristotle University and Hippokration Hospital , Thessaloniki , Greece
10. Arkansas Children’s Hospital Research Institute , Little Rock, Arkansas , USA
11. University of Texas Southwestern Medical Center , Dallas, Texas , USA
12. John Hopkins All Children’s Hospital , St Petersburg, Florida , USA
13. University of California–San Francisco , San Francisco, California , USA
14. Vanderbilt University Medical Center , Nashville, Tennessee , USA
15. University of California San Diego , San Diego, California , USA
16. St Jude Children’s Research Hospital , Memphis, Tennessee , USA
17. Hospital Universitari Vall d’Hebron , Barcelona, Catalonia , Spain
18. University of Alabama , Birmingham, Birmingham, Alabama , USA
19. Cleveland Clinic Foundation , Cleveland, Ohio , USA
20. Weill Cornell Medicine , New York, New York , USA
21. Cohen Children’s Medical Center of New York , New Hyde Park, New York , USA
22. UPMC Children’s Hospital of Pittsburgh , Pittsburgh, Pennsylvania , USA
23. University of Utah , Salt Lake City, Utah , USA and
24. Dell Children’s Medical Center , Austin, Texas , USA