Referencias

1 American Cancer Society, National cancer database breast cancer risk. Last accessed May 2011. http://www.cancer.org/Cancer/BreastCancer/DetailedGuide/breast-cancer-key-statistics 
2 Fuente: Globocan
3 National Cancer Institutes. SEER Stat Fact Sheets. Last accessed May 2015 at http://seer.cancer.gov/statfacts/html/breast.html