1. Department of Paediatrics Tergooi Hospital Blaricum The Netherlands
2. Department of Paediatrics Emma Children's Hospital Amsterdam UMC Amsterdam The Netherlands
3. Department of Paediatrics Spaarne Gasthuis Hospital Hoofddorp The Netherlands
4. Department of Paediatrics Noordwest Ziekenhuisgroep Alkmaar The Netherlands
5. Department of Paediatrics OLVG‐Oost Amsterdam The Netherlands
6. Department of Emergency Medicine Dijklander Hospital Hoorn The Netherlands
7. Department of Paediatrics Flevo Hospital Almere The Netherlands
8. Department of Paediatrics Dijklander Hospital Hoorn The Netherlands
9. Department of Epidemiology and Statistics St Antonius Hospital Nieuwegein The Netherlands