RT Journal Article SR Electronic T1 Pregnancy at time of change of Implanon® implant JF Journal of Family Planning and Reproductive Health Care JO J Fam Plann Reprod Health Care FD British Medical Journal Publishing Group SP 265 OP 265 DO 10.1783/147118909789587402 VO 35 IS 4 A1 Carole A Reader YR 2009 UL http://jfprhc.bmj.com/content/35/4/265.2.abstract AB