00382nas a2200133   4500000000100000000000100001008004100002100001400043700001300057245012700070300001200197490000700209022003200216       2004                            d1 aS. Varney1 aJ. Guest00aRelative cost effectiveness of Depo-Provera, Implanon, and Mirena in reversible long-term hormonal contraception in the UK  a1141-510 v22  a1170-7690 (Print) 1170-7690