Correcting a bias?
D004812:Epidemiologic Methods; D004967:Estrogens / Q000008:administration & dosage / Q000009:adverse effects*; D005260:Female; D006801:Humans; D012107:Research Design; D012306:Risk; D012494:Sampling Studies; D013997:Time Factors; D014592:Uterine Hemorrhage / Q000139:chemically induced; D014594:Uterine Neoplasms / Q000139:chemically induced* / Q000175:diagnosis / Q000453:epidemiology
D004967:Estrogens