PREVALENCE AND RISK FACTORS FOR PRENEOPLASTIC AND NEOPLASTIC LESIONS OF THE COLON AND RECTUM IN PATIENTS UNDER 50 REFERRED FOR COLONOSCOPY - Agazzi, S; Lenti, MV; Klersy, C; Strada, E; Pozzi, L; Rovedatti, L; Costa, S; Costetti, M; Bardone, M; Mauro, A; De Grazia, F; Di Sabatino, A (Endoscopy, 2020)