BCAC: https://bcaott.ca/about-us/who-we-are/ sources: - [https://www.mayoclinic.org/diseases-conditions/breast-cancer/symptoms-causes/syc-20352470](https://www.mayoclinic.org/diseases-conditions/breast-cancer/symptoms-causes/syc-20352470)

- [https://www.komen.org/breast-cancer/risk-factor/age-at-first-period/](https://www.komen.org/breast-cancer/risk-factor/age-at-first-period/)

- https://www.cancer.org/cancer/breast-cancer/risk-and-prevention/lifestyle-related-breast-cancer-risk-factors.html https://www.cancer.org/cancer/breast-cancer/risk-and-prevention/lifestyle-related-breast-cancer-risk-factors.html

- https://www.news-medical.net/health/How-does-Pregnancy-Affect-Breast-Cancer-Risk-and-Survival.aspx https://www.news-medical.net/health/How-does-Pregnancy-Affect-Breast-Cancer-Risk-and-Survival.aspx