1Andersson K. et al. , Randomised comparative trial between levonorgestrel releasing and copper releasing IUDs during five year of use. Contraception , 1994,49 : 56 - 72.
2Clinical Expert Report (Leiras 102 -96965 -02) : Protection from endometrial hyperplasia during estrogen treatment therapy. 10/2000 ( skouby S).
3Brrington JW, Bowen -Simikins P. The levonorgestrel intrauterine system in the management of menorrhagia. Br J Obstet Gynaecol, 1997,104:614 -616.
