5Reefhuis J, Honein MA, Schieve LA, et al. Assisted reproductive technology and major structural birth defects in the United States [ J ]. Hum Reprod, 2009,24 : 360-366.
6Olson CK, Keppler-NoreuiI KM, Romitti PA, et al. In vitro fertilization is associated with an increase in major birth defects [ J ]. FertiI Steri1,2005,84 : 1308-1315.
7Anthony S, Buitendijk SE, Dorrepaal CA, et al. Congenital malformations in 4224 children conceived after IVF [ J ]. Hum Reprod,2002,17:2089-2095.
9Hansen M, Sullivan E, Jequier AM, et al. Practitioner reporting of birth defects in children born following assisted reproductive technology:does it still have a role in surveillance of birth defects ? [ J ]. Hum Reprod, 2007,22 : 516- 520.
10Thurin A, Hausken J, Hillensjo T, et al. Elective singleembryo transfer versus double-embryo transfer in in vitro fertilization[ J]. N Engl J Meal,2004,351:2392-2402.
