1. Paediatric Department, University of Chieti “G. D’Annunzio”, 66100 Chieti, Italy
2. Paediatric Department, Buckinghamshire Healthcare NHS Trust, Aylesbury-Thames Valley Deanery, Aylesbury HP21 8AL, UK
3. Paediatric Department, University of L’Aquila, 67100 L’Aquila, Italy