As from July 11th, 2011, all content on this site, except where noted, is now available under the more permissive Creative Commons Attribution 3.0 license, as specified in the footer. Featured image by Creative Commons under a CC-BY license. Change of license: all content now CC-BY was originally published by Martin Paul Eve at Martin Paul Eve on July 11, 2011.
Martin Paul Eve (Mon,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: