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So EW, Ng EH, Wong YY, Yeung WS, Ho PC.So EW, et al.Reprod Biomed Online. 2010 Jun;20(6):814-21. doi: 10.1016/j.rbmo.2010.02.024. Epub 2010 Mar 4.Reprod Biomed Online. 2010.PMID: 20382081Free article.Clinical Trial.
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