3Olukoya AA et al. Unsafe abortion in adolescent [J] . Int j gynaecol Obstet, 2001, 75 (2) 140-142.
4Van Look PE et al. Unsafe abortion, an avoidable tragedy [J] . Best Pratt Res Clin Obstet Gynaeeol, 2002, 16 (2). 205-209.
5Goyaux. N et al. Complications of induced abortion and miscarriage in three African countries: a hospital-based study among WHO collaborating centers [J] . Acta Obstet Gynecol Scand, 2001, 80:568-573.
6Bankole A et al. Characteristics of Women Who Obtain Induced Abortion. A Worldwide Review [J] . International Family Planning Pespectives, 1999, 25 (2): 68.
7Zhou W et al. Induced Abortion and Placenta Complications in The Subsequent Pregnency [J] . Acta Obstet Gynecol Seand, 2001, 80 (12): 1115-1120.