1. Clinical Epidemiology and Research Center (CERC) Humanitas University & Humanitas Research Hospital Pieve Emanuele (Milano) Italy
2. Department of Health Research Methods, Evidence & Impact McMaster University Hamilton Ontario Canada
3. Department of Medicine, Evidence in Allergy Group McMaster University Hamilton Ontario Canada
4. Pediatric Allergy Unit, Department of Pediatrics, Gynecology and Obstetrics University Hospitals of Geneva Geneva Switzerland
5. Division of Immunology and Allergy, Department of Paediatrics, The Hospital for Sick Children University of Toronto Toronto Ontario Canada