1. Division of Respiratory Medicine and Allergology, Department of Pediatrics, Erasmus MC‐Sophia Children's Hospital, Rotterdam, The Netherlands
2. Department of Radiology, Erasmus MC‐Sophia Children's Hospital, Rotterdam, The Netherlands
3. Department of Pediatrics, University of Verona, Verona, Italy
4. Department of Epidemiology & Biostatistics, Erasmus MC, Rotterdam, The Netherlands
5. Department of Pediatrics, Amphia Hospital, Breda, The Netherlands