RT Journal Article SR Electronic T1 Long-acting reversible contraceptives: not only effective, but also a cost-effective option for the National Health Service JF Journal of Family Planning and Reproductive Health Care JO J Fam Plann Reprod Health Care FD British Medical Journal Publishing Group SP 3 OP 5 DO 10.1783/147118906775275073 VO 32 IS 1 A1 Ifigeneia Mavranezouli A1 Christopher Wilkinson YR 2006 UL http://jfprhc.bmj.com/content/32/1/3.abstract AB