Mackay, E V Contraception with a six-monthly injection of progestogen. 2. Effects on cervical mucus secretion and endocrine function. [electronic resource] - The Australian & New Zealand journal of obstetrics & gynaecology Aug 1971 - 156-63 p. digital Publication Type: Journal Article ISSN: 0004-8666 Standard No.: 10.1111/j.1479-828x.1971.tb00470.x doi Subjects--Topical Terms: AdolescentAdultCervix Mucus--metabolismContraceptive Agents--administration & dosageDelayed-Action PreparationsFemaleGonadal Steroid Hormones--urineHumansInjections, IntramuscularMedroxyprogesterone--administration & dosagePregnancyTime Factors