1. Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
2. Department of Emergency Medicine, University of California, Davis School of Medicine, Sacramento
3. Department of Pediatrics, University of California, Davis School of Medicine, Sacramento
4. Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
5. Division of Emergency Medicine, Ann and Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois
6. Division of Emergency Medicine, Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
7. Division of Clinical Pharmacology and Toxicology, Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
8. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
9. Division of Emergency Medicine, Boston Children’s Hospital, Boston, Massachusetts
10. Department of Pediatrics, McGill University, Montreal, Quebec, Canada
11. Emergency Department, Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera,” CCSS, San José, Costa Rica
12. Department of Emergency Medicine and Trauma Services, Children's National Hospital, Washington, DC
13. Department of Pediatrics, University of Colorado, Aurora
14. Section of Emergency Medicine, Children’s Hospital Colorado, Aurora
15. Division of Emergency and Transport Medicine, Children's Hospital Los Angeles and Keck School of Medicine of the University of Southern California, Los Angeles
16. Department of Emergency Medicine, Children’s Minnesota, Minneapolis
17. Department of Pediatrics, University of California, San Diego, Rady Children’s Hospital, San Diego
18. Department of Pediatrics, St Mary’s Medical Center, West Palm Beach, Florida
19. Pediatric Emergency Department, Hospital Universitario Miguel Servet, Zaragoza, Spain
20. Department of Pediatrics, Washington University in St Louis School of Medicine, St Louis, Missouri
21. Division of Pediatric Emergency Medicine, Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
22. Division of Emergency Medicine, Children’s Hospital of Michigan, Detroit
23. Department of Pediatrics, Central Michigan University, Mt Pleasant
24. Department of Pediatrics, University of Louisville, Louisville, Kentucky
25. Department of Pediatrics, Norton Children’s Hospital, Louisville, Kentucky
26. Department of Pediatrics, Division of Pediatric Emergency Medicine, Emory University School of Medicine, Children’s Healthcare of Atlanta, Atlanta, Georgia
27. Pediatric Emergency Department, Biocruces Bizkaia Health Research Institute, Hospital Universitario Cruces, University of the Basque Country, UPV/EHU Bilbao, Basque Country, Spain
28. Department of Paediatrics, University of British Columbia, Vancouver, British Columbia, Canada
29. Division of Emergency Medicine, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
30. Department of Pediatrics, University of Ottawa, Ottawa, Ontario, Canada
31. Department of Emergency Medicine, University of Ottawa, Ottawa, Ontario, Canada
32. Children’s Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
33. Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, Canada
34. Department of Emergency Medicine, Montefiore-Nyack Hospital, Nyack, New York
35. Division of Pediatric Emergency Medicine, Department of Pediatrics, University of Alabama at Birmingham
36. University of Alberta, Stollery Children’s Hospital, Women’s and Children’s Health Research Institute, Edmonton, Alberta, Canada
37. UPMC Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania
38. Primary Children’s Hospital, Intermountain Healthcare, Salt Lake City, Utah
39. Department of Emergency Medicine, University of Michigan School of Medicine, Ann Arbor
40. Department of Pediatrics, University of Michigan School of Medicine, Ann Arbor
41. Departamento de Emergencia Pediátrica, Hospital General Pediátrico Niños de Acosta Ñu, Facultad de Medicina, Universidad Privada del Pacífico, San Lorenzo, Paraguay
42. Children’s Emergency Department, Starship Children’s Hospital, Auckland, New Zealand
43. Department of Surgery, University of Auckland, Auckland, New Zealand
44. Department of Paediatrics: Child and Youth Health, University of Auckland, Auckland, New Zealand
45. Centers for Disease Control and Prevention, Atlanta, Georgia
46. Division of Infectious Diseases, Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts
47. Emergency Department, Perth Children’s Hospital, Perth, Western Australia
48. Division of Emergency Medicine, School of Medicine, University of Western Australia, Perth, Australia
49. Division of Paediatrics, School of Medicine, University of Western Australia, Perth, Australia
50. Division of Emergency Medicine, Department of Pediatrics, Medical College of Wisconsin, Milwaukee
51. Department of Pediatrics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
52. Hospital de Pediatría “Prof Dr. Juan P. Garrahan,” RIDEPLA, Buenos Aires, Argentina
53. Department of Pediatrics, Hospital Francesc de Borja, Gandia, Spain
54. Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
55. Division of Pediatric Emergency Medicine, Cincinnati Children’s Hospital, Cincinnati, Ohio
56. Department of Pediatrics, Division of Emergency Medicine, McMaster Children’s Hospital, Hamilton, Ontario, Canada
57. Department of Emergency Medicine, KK Women’s and Children’s Hospital, Duke-NUS Medical School, SingHealth Duke-NUS Global Health Institute, Singapore
58. ASST Spedali Civili di Brescia–Pronto soccorso pediatrico, Brescia, Italy
59. Department of Emergency Medicine, New York Presbyterian Morgan Stanley Children’s Hospital, Columbia University Irving Medical Center, New York, New York
60. Department of Pediatric Emergency Medicine, IWK Health Centre, Dalhousie University, Halifax, Nova Scotia, Canada
61. Department of Pediatrics, Schulich School of Medicine & Dentistry, London, Ontario, Canada
62. Department of Emergency Medicine, Lincoln Medical Center, New York, New York
63. Data Analytics and Reporting, Ann and Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois
64. Section of Pediatric Emergency Medicine, Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
65. Section of Gastroenterology, Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
66. Department of Emergency Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
67. for the Pediatric Emergency Research Network–COVID-19 Study Team