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Law LW, Lau TK, Fung TY, Leung TY, Wang CC, Choy KW.Law LW, et al. Among authors: choy kw.BJOG. 2009 Jan;116(2):339-43. doi: 10.1111/j.1471-0528.2008.01948.x. Epub 2008 Nov 11.BJOG. 2009.PMID: 19018765
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Ng LW, Yip SK, Wong HK, Yam GH, Liu YM, Lui WT, Wang CC, Choy KW.Ng LW, et al. Among authors: choy kw.Hum Reprod. 2009 May;24(5):1164-70. doi: 10.1093/humrep/dep001. Epub 2009 Jan 30.Hum Reprod. 2009.PMID: 19181742
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