1. Breast cancer statistics. 2016 March 20, 2016]; Available from: www.cdc.gov/cancer/breast/statistics .
2. Cancer facts and figures 2014. Available from: www.cancer.org/acs/groups/content@research/documents/webcontent/acspc-042151.pdf.Published2014 .
3. Noone. Cancer statistics review. April 16, 2016]; Available from: http://seer.cancer.gov/csr/1975_2008/ .
4. SEER statistics fact sheets: breast cancer. 2016. Available from: http://seer.cancer.gov/statfacts/html/breast.html .
5. Nelson HD et al. Risk factors for breast cancer for women aged 40 to 49 years: a systematic review and meta-analysis. Ann Intern Med. 2012;156(9):635–48.