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de Boer EJ, Den Tonkelaar I, Burger CW, Looman CW, van Leeuwen FE, te Velde ER; OMEGA project group.de Boer EJ, et al. Among authors: van leeuwen fe.Hum Reprod. 2004 Apr;19(4):899-904. doi: 10.1093/humrep/deh178. Epub 2004 Feb 27.Hum Reprod. 2004.PMID: 14990545
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