参考文献
[1]Wade J.J&MacLachlan V.&Kovacs G.The success rate of IVF has significantly improved over the last decade[J].Aust N Z J Obstet Gynaecol,2015,55(5):473-6.
[2]Sosa C.G&Althabe F&Belizán J.M&Bergel E.Bed rest in singleton pregnancies for preventing preterm birth[J].Cochrane Database Syst Rev,2015,30(3):CD003581.