1. Allergy Unit; Department of Paediatrics; Agostino Gemelli Hospital; Sacred Heart Catholic University; Rome Italy
2. Institute for Maternal and Child Health-IRCCS; Burlo Garofolo; Trieste Italy
3. Allergy Unit; Department of Pediatrics; A. Meyer Children's Hospital; University of Florence; Florence Italy
4. University of Trieste; Trieste Italy
5. Department of Paediatrics; Regina Margherita Children's Hospital; University of Turin; Turin Italy