DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Helmerhorst FM, Perquin DA, Donker D, Keirse MJ.
Perinatal outcome of singletons and twins after assisted conception: a systematic review of controlled studies.
BMJ 2004;
328 (7434) 261
DOI: 10.1136/bmj.37957.560278.EE.
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