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Heikinheimo O, Ranta S, Moo-Young A, Lähteenmäki P, Gordon K.Heikinheimo O, et al.Hum Reprod. 1999 Aug;14(8):1993-7. doi: 10.1093/humrep/14.8.1993.Hum Reprod. 1999.PMID: 10438416
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