1. KU Leuven Campus Kulak Kortrijk, Kortrijk, Belgium (H.P.)
2. Lund University and Skåne University Hospital, Lund, Sweden (J.B., A.Å.)
3. Georges Pompidou European Hospital, Assistance Publique Hôpitaux de Paris (AP-HP), Paris Descartes University, INSERM U1151-CNRS UMR8253, Paris, France (M.C.)
4. CHU de Bordeaux, Université de Bordeaux, CNRS-UMR 5164 Immuno ConcEpT, Bordeaux, France (L.C.)
5. Charité Universitätsmedizin Berlin, Institute of Public Health, Berlin, Germany (N.E., E.S.)
6. UiT The Arctic University of Norway, Tromsö, Norway (B.O.E., T.M.)
7. Evelina London Children's Hospital, London, United Kingdom (R.N.D.)
8. Hôpital Edouard Herriot, Hospices Civils de Lyon, Lyon, France (L.D.)
9. Assistance Publique Hôpitaux de Paris (AP-HP), Paris, France (F.G.)
10. Clermont-Ferrand University Hospital, Clermont-Ferrand, France (C.G.)
11. Skåne University Hospital and Lund University, Lund, Sweden (A.G.)
12. CHU Nantes, Nantes University, Nantes, France (L.J.)
13. Karolinska University Hospital Huddinge and Karolinska Institute, Stockholm, Sweden (M.H.)
14. CHU Rangueil, INSERM U1043, IFR–BMT, University Paul Sabatier, Toulouse, France (N.K.)
15. East Kent Hospitals University NHS Foundation Trust, Canterbury, United Kingdom (E.J.L.)
16. Hôpital Necker, Assistance Publique Hôpitaux de Paris (AP-HP)and Université Paris Descartes, Paris, France (C.L.)
17. Karolinska Institute, Huddinge, Sweden (K.L.)
18. Hôpital Nord, CHU de Saint-Etienne, Saint-Etienne, France (C.M.)
19. Hôpital Michallon, CHU Grenoble-Alpes, La Tronche, France (L.R.)
20. Mayo Clinic, Rochester, Minnesota (A.D.R., S.T.)
21. Örebro University, Örebro, Sweden (P.S.)
22. Emma Children's Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands (A.B.)
23. Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden (U.B., K.Å.)
24. Mestrado em Ciências da Saúde–Universidade Caxias do Sul Foundation CAPES, Caxias do Sul, Brazil (L.S.)
25. Skåne University Hospital, Lund, Sweden; Uppsala University, Uppsala, Sweden (A.L.)
26. Lund University, Malmö, Sweden (U.N.)
27. University of Liège (ULg CHU), CHU Sart Tilman, Liège, Belgium, and Hôpital Universitaire Carémeau, Nîmes, France (P.D.)