YIELD OF FLEXIBLE SIGMOIDOSCOPY-BASED SCREENING FOR COLORECTAL NEOPLASIA IN GREEK AVERAGE-RISK INDIVIDUALS: IMPACT OF SERRATED POLYPS - Papastergiou, V; Mathou, N; Giannakopoulos, A; Evgenidi, A; Schoretsanitis, E; Apessou, D; Lenas, M; Paraskeva, K (Endoscopy, 2019)