Measuring the separate effects of low parity and its antecedents on the incidence of ovarian cancer.
D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000150:complications*; D010051:Ovarian Neoplasms / Q000453:epidemiology / Q000209:etiology*; D010298:Parity; D011247:Pregnancy; D012307:Risk Factors