Levonorgestrel concentrations during use of levonorgestrel rod (LNG ROD) implants

Irving Sivin, Pekka Lähteenmäki, Sirpa Ranta, Philip Darney, Cindy Klaisle, Livia Wan, Daniel R. Mishell, Maria Lacarra, Osborn A.C. Viegas, Prapas Bilhareus, Suporn Koetsawang, Manee Piya-Anant, Soledad Diaz, Margarita Pavez, Francisco Alvarez, Vivian Brache, Katherine LaGuardia, Harold Nash, Janet Stern