2[1]Leeker M, Beinder E. Twin pregnancies discordant for anencephalymanagement, pregnancy outcome and review of literature. Eur J Obstet Gynecol Reprod Biol, 2004,114(1):15
3[2]Sebire NJ, Sepulveda W, Hughes KS, et al. Management of twin pregnancies discordant for anencephaly. Br J Obstet Gynaecol, 1997,104(2):216
4[3]HansenM, Kurincank JJ, BoweiC, etal. The risk of major birth defects after intracytoplasmic sperm injection and in vitro fertilization. N Engl Med, 2002,346(10):725