1. Division of Pneumonology, Immunology and Intensive Medicine Department of Pediatrics Charité – Universitätsmedizin Berlin Germany
2. Institute of Laboratory Medicine Universities of Giessen and Marburg Lung Center (UGMLC) German Center for Lung Research (DZL) Philipps University Marburg Marburg Germany
3. Pediatric Allergy Unit Sandro Pertini Hospital Rome Italy
4. Allergy Unit Istituto dermopatico dell'Immacolata (IDI)‐IRCCS Roma Italy
5. Allergology Unit, Policlinico Casilino Hospital Rome Italy
6. L'altra statistica Srl Rome Italy