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<p>Reference</p>
<p>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4363720/</p>
<p>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4350614/</p>
<p>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4053733/</p>
<p>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4015143/</p>
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