Perinatal outcome of singletons and twins after assisted conception: a systematic review of controlled studies

Helmerhorst, Frans M ; Perquin, Denise A M ; Donker, Diane ; Keirse, Marc J N C

BMJ, 2004-01, Vol.328 (7434), p.261-264 [Periódico revisado por pares]

London: British Medical Journal Publishing Group

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