We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitlePerinatal outcome of singletons and twins after assisted conception: a systematic review of controlled studiesAuthorsHelmerhorst, F. MPublicationBMJ, 2004, Vol 328, Issue 7434, p261ISSN0959-8138Publication typearticleDOI10.1136/bmj.37957.560278.ee