References
- Hardman SM, Gebbie AE. The contraceptive needs of the perimenopausal woman. Best Practice Res Clin Obstet Gynaecol 2014;28:903–15
- Erkkola R. The contraceptive needs of the perimenopausal woman. Climacteric 2014;17:723–4
- National Institute for Health and Clinical Excellence. Long- acting reversible contraception. NICE Clinical Guidelines 30, London: RCOG, 2005
- Andersson K, Odlind V, Rybo G. Levonorgestrel-releasing and copper-releasing (Nova T) IUDs during five years of use: a randomized comparative trial. Contraception 1994;49:56–72
- Sivin I, Stern J. Health during prolonged use of levonorgestrel 20 micrograms/d and the copper TCu 380Ag intrauterine contraceptive devices: a multicenter study. International Committee for Contraception Research (ICCR). Fertil Steril 1994;61:70–7
- Xiao BL, Zhou LY, Zhang XL, Jia MC, Luukkainen T, Allonen H. Pharmacokinetic and pharmacodynamic studies of levonorgestrel-releasing intrauterine device. Contraception 1990;41:353–62
- Raudaskoski T, Tapanainen J, Tomas E, et al. Intrauterine 10 microg and 20 microg levonorgestrel systems in postmenopausal women receiving oral oestrogen replacement therapy: clinical, endometrial and metabolic response. BJOG 2002;109:136–44
- Lockhat 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. Fertil Steril 2005;83:398–404
- Weiner E, Victor A, Johansson ED. Plasma levels of d-norgestrel after oral administration. Contraception 1976; 14:563–70
- Dennerstein L, Fotherby K, Burrows GD, Laby B, Wood C. Plasma levels of ethinyl oestradiol and norgestrel during hormone replacement therapy. Maturitas 1980;2:147–54
- Nilsson CG, Haukkamaa M, Vierola H, Luukkainen T. Tissue concentrations of levonorgestrel in women using a levonorgestrel-releasing IUD. Clin Endocrinol (Oxf) 1982;17: 529–36
- World-Health-Organization. Medical Eligibility Criteria for Contraceptive Use. Geneva, Switzerland: WHO, 2000
- Shumaker SA, Legault C, Rapp SR, et al. Estrogen plus progestin and the incidence of dementia and mild cognitive impairment in postmenopausal women: the Women’s Health Initiative Memory Study: a randomized controlled trial. JAMA 2003;289:2651–62