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: British Medical Journal (International Edition), 2004, vol. 328, issue 7434, p 261, ISSN 09598146. ISBN 17561833.

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