1. Department of Pediatric Pneumology, Immunology and Intensive Care Medicine Charité Universitätsmedizin Berlin Berlin Germany
2. Division of Allergy University Department of Pediatrics Pediatric Hospital Bambino Gesù (IRCCS) Rome Italy
3. Department of Pediatrics and Pediatric Allergy Unit Sandro Pertini Hospital Rome Italy
4. Immunology and Allergy Unit “S.Maria degli Angeli” Hospital Pordenone Italy
5. L'altrastatistica srl Consultancy & Training Biostatistics Office Rome Italy