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<article xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" article-type="retraction" xml:lang="en">
<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">AJMB</journal-id>
<journal-title>Avicenna Journal of Medical Biotechnology</journal-title>
<issn pub-type="ppub">2008-2835</issn>
<issn pub-type="epub">2008-4625</issn>
<publisher>
<publisher-name>Avicenna Research Institute</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">AJMB-5-257</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Retraction Announcement</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Retracted: Genotyping Analysis of Circulating Fetal Cells Reveals High Frequency of Vanishing Twin Following Transfer of Multiple Embryos</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Mouawia</surname>
<given-names>Hussein</given-names>
</name>
</contrib>
</contrib-group>
<pub-date pub-type="ppub">
<season>Oct-Dec</season>
<year>2013</year>
</pub-date>
<volume>5</volume>
<issue>4</issue>
<fpage>257</fpage>
<lpage>257</lpage>
<permissions>
<copyright-statement>Copyright &#x00A9; 2013 Avicenna Research Institute</copyright-statement>
<copyright-year>2013</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/">
<p>This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.</p>
</license>
</permissions>
</article-meta>
</front>
<body>
<p><italic><related-article related-article-type="retracted-article" id="RA1" vol="5" page="125">Avicenna J Med Biotech 2013; 5(2): 125-132</related-article></italic></p>
<p>The author has requested that the original article entitled &#x201C;Genotyping Analysis of Circulating Fetal Cells Reveals High Frequency of Vanishing Twin Following Transfer of Multiple Embryos&#x201D; that was published in the April-June 2013 issue of <italic>Avicenna Journal of Medical Biotechnology (AJMB)</italic> be withdrawn because the results were published without the co-workers being aware of this publication. Therefore this paper is retracted, considering the fact that it is contrary to the scientific rules and unrespectful of the contribution of the other authors.</p>
</body>
</article>
