Sing, E J Effects of oral contraceptives on zinc and copper levels in human plasma and endometrium during the menstrual cycle. [electronic resource] - Archives of gynecology Dec 1978 - 303-6 p. digital Publication Type: Journal Article ISSN: 0170-9925 Standard No.: 10.1007/BF02119220 doi Subjects--Topical Terms: AdultContraceptives, Oral--pharmacologyCopper--analysisEndometrium--analysisEthynodiol Diacetate--pharmacologyFemaleHumansMenstruationMestranol--pharmacologyNorethynodrel--pharmacologyZinc--analysis