Prolonged intrauterine contraception: a seven-year randomized study of the levonorgestrel 20 mcg/day (LNg 20) and the Copper T380 Ag IUDS.
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D. Mishell | I. Sivin | E. Coutinho | D. Shoupe | A. Faúndes | V. Brache | F. Alvarez | S. Díaz | M. Pavez | T. Mccarthy | J. Stern | S. el Mahgoub | Juan Díaz | S. Mahgoub | M. Díaz | F. Thevenin | C. E. Mattos | S. Dı́az | C. Mattos