1. Division of Allergology, Immunology and Rhumatology, Department of Paediatrics, University Hospital Center and University of Lausanne, Lausanne, Switzerland
2. Allergy Unit, Department of Paediatrics, University Hospitals of Geneva and University of Geneva, Geneva, Switzerland
3. Department of Paediatrics and Child Health, University College, Cork, Ireland
4. Institute of Social and Preventive Medicine, University Hospital Center and University of Lausanne, Lausanne, Switzerland
5. Department of General Practice, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
6. Department of Paediatrics, University Hospital Center and University of Lausanne, Lausanne, Switzerland