1. Allergy Unit Meyer Children's Hospital IRCCS Florence Italy
2. Immunology Laboratory Meyer Children's Hospital IRCCS Florence Italy
3. Department of Health Sciences University of Florence Florence Italy
4. Immunology Unit Meyer Children's Hospital IRCCS Florence Italy
5. Department of Clinical and Evaluative Epidemiology Trento Health Service Trento Italy
6. Institute of Sciences of Food Production National Research Council of Italy (ISPA‐CNR) Bari Italy