Distal hyperplastic polyps do not predict proximal adenomas: results from a multicentric study of colorectal adenomas. - Sciallero,S.; Costantini,M.; Bertinelli,E.; Castiglione,G.; Onofri,P.; Aste,H.; Casetti,T.; Mantellini,P.; Bucchi,L.; Parri,R, et al. (Gastrointest Endosc, 1997)