Contraception with the Gräfenberg ring. A review of 33 years' experience.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001706:Biopsy; D003273:Contraceptive Devices / Q000009:adverse effects; D004717:Endometrium / Q000473:pathology; D005260:Female; D006801:Humans; D008599:Menstruation Disturbances / Q000209:etiology; D011247:Pregnancy; D014626:Vaginal Smears