Abstract
Click here to read a <a href="~/link.aspx?_id=710A2CA65CA3451F8CFA1292AE58E92D&amp;_z=z">Letter to the Editor</a> about this article.<a href="http://cm.healio.com/sitecore/shell/Controls/Rich%20Text%20Editor/%7E/link.aspx?_id=710A2CA65CA3451F8CFA1292AE58E92D&amp;_z=z"><span style="text-decoration: underline;"><br /> </span></a>
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