1. Department of Pediatric Pulmonology, Emma Children's Hospital Amsterdam University Medical Centers Amsterdam the Netherlands
2. Department of Pediatrics Tergooi Hospital Blaricum the Netherlands
3. Amsterdam University Medical Center University of Amsterdam Amsterdam the Netherlands
4. Department of Pediatrics, Willem‐Alexander Children's Hospital Leiden University Medical Center Leiden the Netherlands
5. Department of Pediatrics Spaarne Gasthuis Hoofddorp the Netherlands
6. Department of Pediatrics Catharina Hospital Eindhoven the Netherlands
7. Department of Pediatric Pulmonology Maastricht University Medical Center Maastricht the Netherlands
8. Department of Pediatric Pulmonology and Allergology, Erasmus University Medical Center Sophia Children's Hospital Rotterdam the Netherlands