1 Department of Pediatric Pulmonology and Allergology, Wilhelmina Children's Hospital, Utrecht University, Utrecht, The Netherlands; Department of Dermatology/Allergology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands. Electronic address: [email protected].
2 Department of Dermatology/Allergology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.
3 Department of Pediatrics, Deventer Hospital, Deventer, The Netherlands.
4 Department of Pediatric Pulmonology and Allergology, Wilhelmina Children's Hospital, Utrecht University, Utrecht, The Netherlands.