1Thurin A,Hausken J,HillensjT,et al.Elective single-embryo transfer versus double-embryo transfer in in vitro fertilization[J].N Engl J Med,2004,351(23):2392-2402.
2Gordts S,Campo R,Puttemans P,et al.Belgian legislation and the effect of elective single embryo transfer on IVF outcome[J].Reprod Biomed Online,2005,10(4):436-441.
3Pandey S,Shetty A,Hamilton M,et al.Obstetric and perinatal outcomes in singleton pregnancies resulting from IVF/ICSI:a systematic review and meta-analysis[J].Hum Reprod Update,2012,18(5):485-503.
4Centers for Disease Control and Prevention(CDC).Assisted Reproductive Technology and Trends in Low Birthweight-Massachusetts,1997-2004[J].MMWR,2009,58(3):49-52.
6Romundstad LB,Romundstad PR,Sunde A,et al.Effects of technology or maternal factors on perinatal outcome after assisted fertilisation:a population-based cohort study[J].Lancet,2008,372(9640):737-743.
7Shih W,Rushford DD,Bourne H,et al.Factors affecting low birthweight after assisted reproduction technology:difference between transfer of fresh and cryopreserved embryos suggests an adverse effect of oocyte collection[J].Hum Reprod,2008,23(7):1644-1653.
8Belva F,Henriet S,Van den Abbeel E,et al.Neonatal outcome of937 children born after transfer of cryopreserved embryos obtained by ICSI and IVF and comparison with outcome data of fresh ICSI and IVF cycles[J].Hum Reprod,2008,23(10):2227-2238.
9Kallén B,Finnstrm O,Lindam A,et al.Congenital malformations in infants born after in vitro fertilization in Sweden[J].Birth Defects Res A Clin Mol Teratol,2010,88(3):137-143.
10Reefhuis J,Honein MA,Schieve LA,et al.Assisted reproductive technology and major structural birth defects in the United States[J].Hum Reprod,2009,24(2):360-366.
3Romundstad LB, Romundstad PR, Sunde A, et al. Effects of technology or maternal factors on perinatal outcome after assisted fertilisation: a population-based cohort study [J]. Lancet, 2008, 372 ( 9640 ):737-743.
4Centers for Disease Control and Prevention (CDC). Assisted reproductive technology and trends in low birthweight- Massachusetts, 1997-2004[J]. MMWR Morb Mortal, 2009, 58 (3): 49-52.
5Sutter PD, Delbaere I, Gerris J, et al. Birthweight of singletons after assisted reproduction is higher after single-than after double- embryo transfer[J]. Hum Reprod, 2006, 10( 21 ): 2633-2637.
6Laura A, Cohen B, Nannini A, et al. A population-based study of maternal and perinatal outcomes associated with assisted reproductive technology in massachusetts [J]. Matem Child Health J, 2007, 11(6):517-525.
7Reefhuis J, Honeinl MA, Schievel LA, et al. Assisted reproductive technology and major structural birth defects in the United States [J]. Hum Reprod, 2009, 24(2): 360-366.
8Hansen M, Bower C, Milne E, et al. Assisted reproductive technologies and the risk of birth defects-a systematic eview [J]. Hum Reprod, 2005, 20(2) : 328-338.
9Zhu JL, Basso O, Obel C, et al. Infertility, infertility treatment, and congenital malformations: Danish national birth cohort[J]. BMJ, 2006, 333(7570): 679.
10Bowdin S, Allen C, Kirby G, et al. A survey of assisted reproductive technology births and imprinting disorders[J]. Hum Reprod, 2007, 22( 12): 3237-3240.
