| http://www.w3.org/ns/prov#value | - The contraceptive skin implant (Implanon) works for three years.he is in contrast to birth control pills and other reversible forms of contraception, which require consistent and correct use.According to ACOG, research has shown that IUDs and contraceptive implants are more effective.A study earlier this year found that 0.8 percent of U.S. women using a copper IUD had an unplanned pregnancy withi
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