https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(02)09962-2/fulltext?code=lancet-site

.https://www.nice.org.uk/about/what-we-do/our-programmes/nice-guidance/nice-guidelines/making-decisions-using-nice-guidelines#professional-guidelines

https://www.nice.org.uk/guidance/cg164

https://www.nice.org.uk/guidance/cg164/chapter/recommendations#breast-cancer-risk-category