4Mavranezouli I LARC Guideline Development Group. The cost - effective- ness of long - acting reversible contraceptive methods in the UK : analysis based on a decision - analytic model developed for a National Institute for Health and Clinical Excellence(NICE) clinical practice guideline[J]. Hum Reprod,2011,23(6):l 338 - 1 345.
5Comes MK, Ferriani RA, Rosa e Silva JC, et al. The levonorgestrel - re- leasing intrauterine system and endometriosis staging[J]. Fertil Steril, 2011,87(5):1 231 - 1 234.