2Macklon NS, Geraedts JP, Fauser BC. Conception to ongoing pregnancy:the "black box" of early pregnancy loss[J]. Hum Reprod Update, 2002,8 : 333-343.
3No authors listed. Gestation, birth-weight, and spontaneous abortion in pregnancy after induced abortion. Report of Collaborative Study by W. H. O. Task Force on Sequelae of Abortion[J]. Lancet, 1979,1 :142-145.
4Atrash HK, Hogue CJ. The effect of pregnancy termination on future reproduction[J]. Baillieres Clin Obstet Gynaecol, 1990,4:391-405.
5Brown JS Jr, Adera T, Masho SW. Previous abortion and the risk of low birth weight and preterm births[J]. J Epidemiol Community Health, 2008,62 :16-22.
6Zhu QX, Gao ES, Chen AM, et al. Mifepristone-induced abortion and placental complications in subsequent pregnancy [J]. Hum Reprod,2009,24 :315-319.
7Virk J, Zhang J, Olsen J. Medical abortion and the risk of subsequent adverse pregnancy outcomes[J]. N Engl J Med, 2007,357 :648-653.
8Lv F, Xu X, Wang L, et al. Repeated abortion affects subsequent pregnancy outcomes in BALB/c mice[J]. PLoS One, 2012,7 : e48384.
10Bello B, Kielkowski D, Heederik D, et al. Time-to-pregnancy and pregnancy outcomes in a South African population[J]. BMC Public Health, 2010,10 : 565.
