RT Journal Article SR Electronic T1 Extended Effectiveness of the Etonogestrel-Releasing Contraceptive Implant and the 20 µg Levonorgestrel-Releasing Intrauterine System for 2 Years Beyond U.S. Food and Drug Administration Product Labeling JF Global Health: Science and Practice JO GLOB HEALTH SCI PRACT FD Johns Hopkins University- Global Health. Bloomberg School of Public Health, Center for Communication Programs SP 534 OP 539 DO 10.9745/GHSP-D-17-00296 VO 5 IS 4 A1 Moazzam Ali A1 Luis Bahamondes A1 Sihem Bent Landoulsi YR 2017 UL http://www.ghspjournal.org/content/5/4/534.abstract AB