title: Re: "Replacement estrogens and breast cancer": variance estimates in cohort studies with sampling for covariates.
mesh_terms: D001943:Breast Neoplasms / Q000139:chemically induced*; D004967:Estrogens / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008875:Middle Aged; D013223:Statistics as Topic; D014861:Washington
chemical_list: D004967:Estrogens