Contraception with long-acting subdermal implants. A five-year clinical trial with silastic covered rod implants containing levonorgestrel von Robertson, Dale N., Diaz, Soledad, Alvarez-Sanchez, Francisco, Holma, Pentti, Mishell, Daniel R., Coutinho, Elsimar, Brache, Vivian, Croxatto, Horacio B., Paundes, Anibal, Lacarra, Maria, Pavez, Margarita, Roy, Subir, da Silva, Ana Rita, Sivin, Irving, Stern, Janet

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