1. Department of Surgery, Tor Vergata University of Rome, Viale Oxford 81, 00133 Rome, Italy
2. Department of Medical and Surgical Sciences for Children and Adults, University of Modena and Reggio Emilia (UNIMO), Modena, Italy
3. Obesity Unit, Department of Surgery, University of Rome “Tor Vergata”, Rome, Italy
4. Department of Surgery “Pietro Valdoni”, Sapienza University of Rome, Via Lancisi 2, 00155 Rome, Italy