1. Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children’s Hospital, Boston, Massachusetts, USA
3. Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
4. Department of Anesthesia, Harvard Medical School, Boston, Massachusetts, USA
5. Division of Critical Care, Department of Anesthesiology and Critical Care, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
6. Division of Critical Care Medicine, Department of Pediatrics, Northwestern University Feinberg School of Medicine, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois, USA
7. Division of Pediatric Infectious Diseases, Department of Pediatrics, Children’s Mercy Kansas City, Kansas City, Missouri, USA
8. Department of Pediatrics, Children’s Hospital of Orange County, Orange, California, USA
9. Department of Pediatrics, Section of Critical Care Medicine, University of Colorado School of Medicine and Children’s Hospital Colorado, Aurora, Colorado, USA
10. Division of Critical Care Medicine, Department of Pediatrics, Nationwide Children’s Hospital, Columbus, Ohio, USA
11. Division of Critical Care Medicine, Department of Pediatrics, Akron Children’s Hospital, Akron, Ohio, USA
12. Division of Pediatric Critical Care Medicine, Department of Pediatrics, Mott Children’s Hospital and University of Michigan, Ann Arbor, Michigan, USA
13. Division of Pediatric Critical Care, Department of Pediatrics, Saint Barnabas Medical Center, Livingston, New Jersey, USA
14. Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
15. Section of Pediatric Critical Care, Department of Pediatrics, Arkansas Children’s Hospital, Little Rock, Arkansas, USA
16. Division of Pediatric Critical Care, University of Minnesota Masonic Children’s Hospital, Minneapolis, Minnesota, USA
17. Division of Pediatric Critical Care, Department of Pediatrics, University of Nebraska Medical Center, Omaha, Nebraska, USA
18. Division of Pediatric Critical Care Medicine, Rainbow Babies and Children’s Hospital, Cleveland, Ohio, USA
19. Department of Pediatrics, Penn State Hershey Children’s Hospital, Penn State University College of Medicine, Hershey, Pennsylvania, USA
20. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
21. Alabama: Children’s of Alabama, Birmingham
22. Arkansas: Arkansas Children’s Hospital, Little Rock
23. California: Children’s Hospital of Orange County, Orange County
24. Colorado: Children’s Hospital Colorado, Aurora
25. Illinois: Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago
26. Massachusetts: Boston Children’s Hospital, Boston
27. Michigan: University of Michigan CS Mott Children’s Hospital, Ann Arbor
28. Minnesota: University of Minnesota Masonic Children’s Hospital, Minneapolis
29. Missouri: Children’s Mercy Hospital, Kansas City
30. Nebraska: Children’s Hospital & Medical Center, Omaha
31. New Jersey: St. Barnabas Medical Center, Livingston
32. Ohio: Akron Children’s Hospital, Akron
33. University Hospitals Rainbow Babies and Children’s Hospital, Cleveland
34. Nationwide Children’s Hospital, Columbus
35. Pennsylvania: Children’s Hospital of Philadelphia, Philadelphia
36. Penn State Children’s Hospital, Hershey
37. Tennessee: Monroe Carell Jr. Children’s Hospital at Vanderbilt, Nashville
38. Centers for Disease Control and Prevention (CDC)