1. Universita degli Studi di Napoli; Dipartimento di Chirurgia Generale (Edif. 6); Via S. Pansini, 5 Napoli Italy 80131
2. University of Milan; Department of Biomedical Sciences for Health; Via Pascal 36 Milan Italy 20133
3. AUP FEDERICO II NAPOLI; Clinica Medica; via Pansini 5 Napoli Italy
4. University of Naples Federico II; Department of General Surgery, Geriatry and Endoscopy; Naples Italy
5. PO Ascalesi; Department of General Surgery; Naples Italy
6. Faculty of Medicine and Surgery, University Frederico II of Naples; Department of General, Geriatric surgery, diagnostic and operative endoscopy; Naples Italy
7. Mario Negri Institute for Pharmacological Research; Italian Cochrane Centre; Via La Masa, 19 Milan Italy 20156