1. Rheumatology Research Unit, Department of Clinical Medicine and Surgery, University Federico II, Via Sergio Pansini 5, 80131 Naples, Italy
2. Complex Operating Unit of Gastroenterology, AORN ‘A. Cardarelli’, Naples, Italy
3. Rheumatology Research Unit and Department of Clinical Medicine and Surgery, University Federico II, Naples, Italy
4. Rheumatology and Rehabilitation Research Unit ‘Salvatore Maugeri’ Foundation, Telese Terme (BN), Italy
5. Department of Clinical Medicine and Surgery, University Federico II, Naples, Italy