Burchardt NA, Eliassen AH, Shafrir AL, Rosner B, et al. Oral contraceptive use by formulation and breast cancer risk by subtype in the Nurses' Health Study II: a prospective cohort study. Am J Obstet Gynecol 2021 Dec 15. pii: S0002-9378(21)02686.
PMID: 34921803