1. Department of Health Sciences; Meyer University Hospital; University of Florence; Florence Italy
2. Division of Pediatrics; Department of Health Sciences; IRCAD (Interdisciplinary Research Center of Autoimmune Diseases); University of Piemonte Orientale Amedeo Avogadro; Novara Italy
3. Department of Paediatrics; Regina Margherita Children's Hospital; University of Turin; Turin Italy
4. Paediatric Clinic; San Paolo Hospital; Milan Italy
5. Pediatric Infectious Diseases Unit; Department of Pediatrics; Gemelli Hospital; Catholic University A; Rome Italy
6. Pediatric Division; Department of Clinical Sciences; Polytechnic University of Marche, Ospedali Riuniti, Presidio Salesi; Ancona Italy
7. Department of Pediatrics; Sant'Antonio Hospital; San Daniele del Friuli Italy
8. Department of Sciences for Health Promotion and Mother and Child Care; University of Palermo; Palermo Italy