title: Potential for bias in case-control studies of oral contraceptives and breast cancer.
authors.affiliation: Department of Preventive and Social Medicine, University of Otago, Dunedin, New Zealand.
authors.forename: D C
authors.initials: DC
authors.lastname: Skegg
mesh_terms: D001943:Breast Neoplasms / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D012107:Research Design; D012306:Risk; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral