1. General and Emergency Paediatrics Operative Unit, Policlinico-Vittorio Emanuele University Hospital, University of Catania, Catania, Italy
2. Tehran University of Medical Sciences, Tehran, Iran
3. ENT Department, University of Catania, Catania, Italy
4. Centre of Physical Medicine and Rehabilitation, Policlinico-Vittorio Emanuele Hospital, University of Catania, Catania, Italy
5. Pediatric Nephrology O.U., La Sapienza University of Rome, Rome, Italy