1. Department of Pediatric Pulmonology and Allergology, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, the Netherlands.
2. Department of Radiology and Nuclear Medicine and Erasmus Medical Center, Rotterdam, the Netherlands.
3. Department of Biostatistics, Erasmus Medical Center, Rotterdam, the Netherlands.
4. Novartis Pharma AG, Basel, Switzerland.
5. Novartis Pharmaceuticals Corporation, East Hanover, New Jersey.