Subcutaneous DMPA vs. intramuscular DMPA: a 2-year randomized study of contraceptive efficacy and bone mineral density.
Contraception. 2009 Jul;80(1):7-17. doi: 10.1016/j.contraception.2009.02.005. Epub 2009 Mar 27.
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PMID: 19501210
Clinical Trial.