1. Contraceptive use—efficacy study utilizing medroxyprogesterone acetate administered as an intramuscular injection once every 90 days;Schwallie;Fertil Steril,1973
2. Levonorgestrel-releasing and copper-releasing (Nova T) IUDs during five years of use: a randomized comparative trial;Andersson;Contraception,1994
3. Canadian contraception consensus. SOGC clinical practice guidelines, No. 143, February 2004;Black;J Obstet Gynaecol Can,2004
4. Canadian contraception consensus. SOGC clinical practice guidelines, No. 143, March 2004;Black;J Obstet Gynaecol Can,2004
5. Canadian contraception consensus. SOGC clinical practice guidelines, No. 143, April 2004;Black;J Obstet Gynaecol Can,2004