1. Infectious Disease Unit Department of Science Health Meyer Children's Hospital University of Florence Florence Italy
2. Pediatric Clinic Fondazione IRCCS Policlinico San Matteo University of Pavia Pavia Italy
3. Department of Clinical and Experimental Medicine University of Catania Catania Italy
4. Gastroenterology and Nutrition Unit Meyer Children's Hospital Department of Neurology, Pharmacology, Psychology and Child Health (NEUROFARBA) University of Florence Florence Italy