6Grimes D, Schulz K, van Vliet H, et al. Immediate post-partum insertion of intrauterine devices. Cochrane Database Syst Rev, 2003, (1):CD003036.
7Harrison-Woolrych M, Ashton J, Coulter D. Uterine perforation on intrauterine device insertion: is the incidence higher than previously reported? Contraception, 2003 , 67( 1):53-56.
8Avid H, Carmen C, Daniel H, et al. The costs and benefits of IUD follow-up visits in the Mexican social security institute. Inter Fam Plann Perspect, 1999, 25:21-26.
10Lockhat FB,Emembolu JE,Konje JC.Serum and peritoneal fluid levels of levonorgestrel in women with endometriosis who were treated with an intrauterine contraceptive device containing levonorgestrel[J].Fertil Steril,2005,83:398-404.
