1. Section of Allergy and Clinical Immunology Department of Internal Medicine Erasmus University Medical Center Rotterdam The Netherlands
2. Department of Dermatology Erasmus University MC Sophia Children's Hospital Rotterdam The Netherlands
3. Section of Allergy Department of Paediatric Medicine Erasmus University MC Sophia Children's Hospital Rotterdam The Netherlands
4. Department of Pathology Erasmus University MC Rotterdam The Netherlands
5. Department of Paediatric Haematology Erasmus University MC Sophia Children's Hospital Rotterdam The Netherlands
6. Department of Immunology Erasmus University MC Rotterdam The Netherlands