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4. Bacon, H. E.: Anus, Rectum, Sigmoid Colon: Diagnosis and Treatment. Ed. 3, Philadelphia, J. B. Lippincott Company, 1949, vol. 2, p. 617.
5. Bacon, H. E. and G. G. Broad: Pathogenesis of adenomatous polyps in relation to malignancy of the large bowel. Rev. Gastroenterol.15: 284, 1948.