1. Department of Advanced Biomedical Sciences, “Federico II” University of Naples, Via Pansini 5, 80131 Naples, Italy
2. Department of Clinical Medicine and Surgery, “Federico II” University of Naples, Via Pansini 5, 80131 Naples, Italy
3. Operative Unit of Gastroenterology, Pineta Grande Hospital, Via Domitiana Km 30, 81030 Castel Volturno, Caserta (CE), Italy