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https://www.cancer.org/research/cancer-facts-statistics/all-cancer-facts-figures/cancer-facts-figures-2018.html
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https://www.cancer.gov/types/breast
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https://www.cancer.org/content/dam/cancer-org/research/cancer-facts-and-statistics/annual-cancer-facts-and-figures/2018/estimated-number-of-deaths-for-the-four-major-cancers-by-sex-and-age-group-2018.pdf
5. American Cancer Society (2019) Survival rates for breast cancer.
https://www.cancer.org/cancer/breast-cancer/understanding-a-breast-cancer-diagnosis/breast-cancer-survival-rates.html