1. Department of Respiratory Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
2. Department of Pediatrics, Pediatric Pulmonology & Allergology, Erasmus Medical Center-Sophia Children's Hospital, Rotterdam, The Netherlands
3. Division of Pharmacoepidemiology & Clinical Pharmacology, Utrecht Institute for Pharmaceutical Science, Utrecht University, Utrecht, The Netherlands
4. University of Groningen, University Medical Center Groningen, Department of Pediatric Pulmonology & Pediatric Allergology, Beatrix Children's Hospital, Groningen, The Netherlands
5. University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma & COPD (GRIAC), Groningen, The Netherlands