Magnification endoscopy to detect dysplastic aberrant crypt foci in Mexican patients with high risk for colorectal cancer - Monte Julio; Herrera-Goepfert Roberto; Hernández-Guerrero Angelica; Sobrino-Cossío S Sergio; Trejo-Vázquez Fabiola; Alonso-Larraga JO Juan (BMC Cancer, 2007)