keywords: radcliffe hurting marathon 39 paula
text:  #39;I felt I #39;d let everyone down. But nobody was hurting inside as &lt;b&gt;...&lt;/b&gt; The search for the reasons behind Paula Radcliffe #39;s disastrous performance in the Olympic marathon moved yesterday to a medical laboratory in Athens, where blood samples taken from the 30-year-old athlete were being analysed in the hope of discovering 