3Ankum WM, Van der Veen F, Hamrlynck Ivth H, Lammes FB. Laparoscopy: a dispensable tool in the diagnosis of ectopic preganacy[ J]. Hum Reprod, 1993,8 : 1301 - 1306.
4Font F, Gonz' alez MA, Nathan R, et al. Maternal mortality in a rural district of southeastern Tanzania: an application of the sisterhood method. Int J Epidemiol,2000,29(1):107.
5Daponte A, Guidozzi F,Marinernu A. Maternal mortaity in tertiary center after introduction of free anteuatal care. Int J Gynecol Obstet, 2000,71 (2):127.