1. Clinical epidemiology the essentials;Fletcher,1996
2. Invasive carcinoma of the large intestine: a preventable disease?;Gilbertsen;Surgery,1965
3. Genetic alterations during colorectal-tumor development;Vogelstein;N Engl J Med,1988
4. Effect of screening colonoscopy on colorectal cancer incidence and mortality;Kahi;Clin Gastroenterol Hepatol,2009
5. Use of colonoscopy to screen asymptomatic adults for colorectal cancer. Veterans Affairs Cooperative Study Group 380;Lieberman;N Engl J Med,2000