1. American Cancer Society: http://www.cancer.org/docroot/CRI/CRI_2_1x.asp?dt=5.
2. National Cancer Institute: http://seer.cancer.gov/statfacts/html/breast.html.
3. Canadian National Breast Screening Study. 1. Breast cancer detection and death rates among women aged 40–49 years;Miller;Can Med Assoc J,1992
4. Canadian National Breast Screening Study. 2. Breast cancer detection and death rates among women aged 50–59 years;Miller;Can Med Assoc J,1992
5. Some pitfalls in the evaluation of screening programs;Feinleib;Arch Environ Health,1969