<a class="external mw-magiclink-pmid" rel="nofollow" href="//www.ncbi.nlm.nih.gov/pubmed/20827272?dopt=Abstract">PMID 20827272</a>
<a href="//commons.wikimedia.org/wiki/User:Nuklear" title="User:Nuklear">Nuklear</a>
<span class="int-own-work" lang="en">Own work</span>