Haemoglobin levels in contraceptive users.
D003276:Contraceptives, Oral / Q000494:pharmacology*; D005260:Female; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D008598:Menstruation
D003276:Contraceptives, Oral; D006454:Hemoglobins