1. Allergy Unit; Department of Pediatric Medicine; Anna Meyer Children's University Hospital; Florence Italy
2. Internal Medicine Unit; Department of Experimental and Clinical Medicine; University of Florence; Florence Italy
3. Department of Pediatric Medicine; Anna Meyer Children's University Hospital; Florence Italy
4. Department of Dermatology; Anna Meyer Children's University Hospital; Florence Italy
5. Pediatric Infectious Diseases Division; Department of Pediatric Medicine; Anna Meyer Children's University Hospital; Florence Italy