1. Cancer statistics, 1998;Landis;CA Cancer J. Clin.,1998
2. U.S. Cancer incidence, mortality, and survival: 1973–1996;Garfinkel;Stat. Bull.,1999
3. Colorectal cancer screening practices among primary care physicians in high-risk countries;Cooper;Gastroenterology,1999
4. 1989 Survey of physicians' attitudes and practices in early cancer detection;CA Cancer J. Clin.,1990
5. Approach to the patient with occult gastrointestinal bleeding: textbook of gastroenterology;Ahlquist,1995