title: Lactation and the risk of breast cancer.
authors.forename: J L
authors.initials: JL
authors.lastname: Kelsey
authors.forename: E M
authors.initials: EM
authors.lastname: John
mesh_terms: D000367:Age Factors; D001943:Breast Neoplasms / Q000209:etiology*; D005260:Female; D006801:Humans; D007774:Lactation; D008875:Middle Aged; D017697:Premenopause; D012307:Risk Factors