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17. Two years of intrauterine contraception with levonorgestrel and with copper: a randomized comparison of the TCu 380Ag and levonorgestrel 20 mcg/day devices. Sivin I, Stern J, Diaz J, Diaz MM, Faundes A, el Mahgoub S, Diaz S, Pavez M, Coutinho E, Mattos CE. Contraception; 1987 Mar; 35(3):245-55. PubMed ID: 3111785 [Abstract] [Full Text] [Related]