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Youssef MA, van Wely M, Hassan MA, Al-Inany HG, Mochtar M, Khattab S, van der Veen F.Youssef MA, et al. Among authors: khattab s.Hum Reprod Update. 2010 Sep-Oct;16(5):459-66. doi: 10.1093/humupd/dmq006. Epub 2010 Mar 30.Hum Reprod Update. 2010.PMID: 20354100Review.