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2. 2 NS Williams (1993 1st edition) Polypad disease and polyposis syndromes . InSurgery of the Anus, Rectum and Colon.(eds Keighley MRB and Williams NS), pp. 760-829. W. B. Saunders, Philadelphia.
3. Diagnostic and Therapeutic Colonoscopy
4. Morphology, Anatomic Distribution and Cancer Potential of Colonic Polyps