High resolution endoscopy and the additional value of chromoendoscopy in the evaluation of duodenal adenomatosis in patients with familial adenomatous polyposis - Dekker, E.; Boparai, K. S.; Poley, J. W.; Mathus-Vliegen, E. M. H.; Offerhaus, G. J. A.; Kuipers, E. J.; Fockens, P.; Dees, J. (Endoscopy, 2009)