Leiden University - Willem-Alexander Children’s Hospital, Leiden University - Willem-Alexander Children’s Hospital, Erasmus University Rotterdam (EUR) - Department of Paediatric Nephrology, Tergooi Medical Center - Department of Paediatrics, University of Amsterdam - Department of Pediatric Pulmonology, Erasmus University Rotterdam (EUR) - Department of General Paediatrics, Erasmus University Rotterdam (EUR) - Department of Paediatric Intensive Care, University of Amsterdam - Department of Pediatric Pulmonology, Zaans Medical Centre - Department of Paediatrics, Radboud University Nijmegen - Section of Paediatric Infectious Diseases, University of Groningen - Department of Paediatric Rheumatology, Ommelander Hospital - Department of Paediatrics, Maastricht University - Department of Pediatrics, Canisius Wilhelmina Hospital - Department of Paediatrics, Academic Hospital Paramaribo - Department of Paediatrics, Alrijne Hospital - Department of Paediatrics, Isala Hospital - Department of Paediatrics, University of Amsterdam - Department of Paediatric Immunology, Rheumatology and Infectious Disease, BovenIJ Hospital - Department of Paediatrics, Elkerliek Hospital - Department of Paediatrics, Leiden University - Willem-Alexander Children’s Hospital, Utrecht University - Julius Center, Bravis Hospital - Department of Paediatrics, Meander Medical Centre - Department of Paediatrics, Erasmus University Rotterdam (EUR) - Department of Paediatric Infectious Diseases and Immunology, Groene Hart Hospital - Department of Paediatrics, ZorgSaam Hospital - Department of Paediatrics, Maasstad Hospital - Department of Paediatrics, University of Amsterdam - Department of Paediatric Immunology, Rheumatology and Infectious Disease, Amphia Hospital - Department of Paediatrics, Zuyderland Medical Centre - Department of Paediatrics, Leiden University - Willem-Alexander Children’s Hospital, Deventer Ziekenhuis - Department of Paediatrics, Spaarne Gasthuis Academy, Slingeland Hospital - Department of Paediatrics, Curaçao Medical Center - Department of Paediatrics, Martini Hospital - Department of Paediatrics, Erasmus University Rotterdam (EUR) - Department of Paediatric Intensive Care, Bernhoven - Department of Paediatrics, Academic Hospital Paramaribo - Department of Paediatrics, University of Amsterdam - Department of Paediatric Immunology, Rheumatology and Infectious Disease, University of Amsterdam - Department of Pediatric Immunology, Rheumatology and Infectious Disease, Albert Schweitzer Hospital - Department of Paediatrics, University of Groningen - Department of Paediatric Rheumatology, Curaçao Medical Center - Department of Paediatrics, Curaçao Medical Center - Department of Paediatrics, Catharina Hospital - Department of Paediatrics, Elisabeth-Tweesteden Hospital - Department of Paediatrics, Maxima Medical Centre - Department of Paediatrics, Gelre Hospital - Department of Paediatrics, Haga Hospital - Department of Paediatrics, Radboud University Nijmegen - Department of Paediatric Intensive Care, Erasmus University Rotterdam (EUR) - Department of Paediatric Pulmonology, Haga Hospital - Department of Paediatrics, Admiraal De Ruyter Hospital - Department of Paediatrics, Leiden University - Willem-Alexander Children’s Hospital, Leiden University - Willem-Alexander Children’s Hospital, Maastricht University - Department of Pediatrics, Radboud University Nijmegen - Section of Paediatric Infectious Diseases, Dijklander Hospital - Department of Paediatrics, Princess Maxima Center for Pediatric Oncology, Franciscus Gasthuis & Vlietland - Department of Paediatrics, Maasstad Hospital - Department of Paediatrics, Utrecht University - Department of Paediatric Rheumatology,, Haga Hospital - Department of Paediatrics, Leiden University - Willem-Alexander Children’s Hospital, St Jansdal Hospital - Department of Paediatrics, Haaglanden Medical Center - Department of Paediatrics, Utrecht University - Department of Paediatric Infectious Diseases, Radboud University Nijmegen - Department of Pharmacology and Toxicology, Bravis Hospital - Department of Paediatrics, Leiden University - Willem-Alexander Children’s Hospital and Leiden University - Willem-Alexander Children’s Hospital

University of Aberdeen - Royal Aberdeen Children’s Hospital, University of Aberdeen - Health Services Research Unit, University of Aberdeen - Health Services Research Unit, University of Aberdeen - Health Services Research Unit, University of Aberdeen, University of Aberdeen, University of Aberdeen - Institute of Applied Health Sciences, University of Aberdeen - Health Services Research Unit, University of Aberdeen - Health Services Research Unit, University of Aberdeen - Health Services Research Unit, University of Aberdeen - Health Services Research Unit, University of Aberdeen, University of Aberdeen - Health Services Research Unit, University of Edinburgh - Edinburgh Clinical Trials Unit (ECTU), University of Aberdeen - Health Services Research Unit, University of Leicester - Department of Respiratory Sciences, Erasmus University Rotterdam (EUR) - Erasmus Medical Center (MC), Erasmus University Rotterdam (EUR) - Department of Paediatric Pulmonology, University of Southampton - Primary Care and Population Sciences and University of Aberdeen - Centre of Academic Primary CareObservational and Pragmatic Research Institute Pte Ltd (OPRI)