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• Perinatal Outcome of Singletons and Twins After Assisted Conceptions: A Systematic Review of Controlled Studies 

  Helmerhorst, Frans M.; Perquin, Denise A.M.; Donker, Diane; Keirse, Marc J.N.C. (2004-01-31)

  OBJECTIVE: To compare the perinatal outcome of singleton and twin pregnancies between natural and assisted conceptions. DESIGN: Systematic review of controlled studies published 1985-2002. STUDIES REVIEWED: 25 studies ...