Predictive value of morphologic characteristics in rectosigmoid adenomatous polyps for the probability of synchronous polyps or cancer in the proximal colon - ERDEM, Levent; AKBAYIR, Nihat; YILDIRIM, Sadık; KÖKSAL, Hakan M.; YENİCE, Necati; GÜLTEKİN, Orhan S.; SAKIZ, Damlanur; PEKER, Önder (Turkish Journal of Gastroenterology, 2005)