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A multicenter randomized clinical trial of one-rod etonogestrel and two-rod levonorgestrel contraceptive implants with nonrandomized copper-IUD controls: methodology and insertion data.
Meirik O, Brache V, Orawan K, Habib NA, Schmidt J, Ortayli N, Culwell K, Jackson E, Ali M; WHO Study Group on Contraceptive Implants for Women. Meirik O, et al. Contraception. 2013 Jan;87(1):113-20. doi: 10.1016/j.contraception.2012.08.044. Epub 2012 Oct 10. Contraception. 2013. PMID: 23063337 Clinical Trial.