Low dose mifepristone and two regimens of levonorgestrel for emergency contraception: a WHO multicentre randomised trial. von Hertzen H, Piaggio G, Ding J, et al. Lancet 2002; 360(9348): 1803-1810
Low dose mifepristone and two regimens of levonorgestrel for emergency contraception: a WHO multicentre randomised trial. von Hertzen H, Piaggio G, Ding J, et al. Lancet 2002; 360(9348): 1803-1810