Comment on

• A case-control study of screening sigmoidoscopy and mortality from colorectal cancer.

  Selby JV, Friedman GD, Quesenberry CP Jr, Weiss NS. Selby JV, et al. N Engl J Med. 1992 Mar 5;326(10):653-7. doi: 10.1056/NEJM199203053261001. N Engl J Med. 1992. PMID: 1736103
• Long-term risk of colorectal cancer after excision of rectosigmoid adenomas.

  Atkin WS, Morson BC, Cuzick J. Atkin WS, et al. N Engl J Med. 1992 Mar 5;326(10):658-62. doi: 10.1056/NEJM199203053261002. N Engl J Med. 1992. PMID: 1736104