<div>More recent data on this issue below.  The source might seem dubious, but offers a long list of references that can be checked:</div>
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<div><a href="http://www.healthjobsnationwide.com/news.php?articleID=43">http://www.healthjobsnationwide.com/news.php?articleID=43</a></div>
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<div>Vision2020 Post: Ted Moffett</div>