1. Allergy Unit Meyer Children's Hospital IRCCS Florence Italy
2. Department of Health Sciences University of Florence Florence Italy
3. Gastroenterology and Nutrition Unit Meyer Children's Hospital IRCCS Florence Italy
4. Department of Neurofarba University of Florence Florence Italy
5. Pediatric Clinic, Department of Medical and Surgical Science University of Perugia Perugia Italy
6. Pediatric Gastroenterology Unit Maggiore Hospital Bologna Italy
7. Institute of Pathology, ASST‐Spedali Civili Brescia Italy