Infection prevention in endoscopy practice: comparative evaluation of re-usable vs single-use endoscopic valves oleh L. Pasquale, A. Maurano, G. Cengia, P. Da Massa Carrara, B. Germanà, M.G. Graziani, G. Manes, A. Pisani, M. Golia, E. Marciano, L. Rodella, L. Schiffino, C. Gandolfo, C. Terrosi, M.G. Cusi