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