Reply to Hoff et al.

References

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• 2 Hoff G, Thiis-Evensen E, Grotmol T. et al . Do undesirable effects of screening affect all-cause mortality in flexible sigmoidoscopy programmes? Experience from the Telemark Polyp Study, 1983 - 1996.  Eur J Cancer Prev. 2001;  10 131-137
• 3 Black W C, Haggstrom D A, Welch H G. All-cause mortality in randomized trials of cancer screening.  J Natl Cancer Inst. 2002;  94 167-173
• 4 Muller A D, Sonnenberg A. Prevention of colorectal cancer by flexible endoscopy and polypectomy: a case-control study of 32 702 veterans.  Ann Intern Med. 1995;  123 904-910
• 5 Thiis-Evensen E, Hoff G S, Sauar J. et al . Population-based surveillance by colonoscopy: effect on the incidence of colorectal cancer. Telemark Polyp Study I.  Scand J Gastroenterol. 1999;  34 414-420