anchor.diff:  
   <h2 class="pv-drugs-header">Drugs of interest</h2>
   <table id="pv-drugs-table">
  +   <thead>
       <tr>
           <th>Drug Name</th>
           <th>Drug Target</th>
  
positive.code:         <th>Phase</th>
          <th>Location</th>
      </tr>
  </table>
negative.code:         <th>FDA approved?</th>
          <th>Data Sources</th>
      </tr>
     </thead>
  
  </table>
  
  
  <h2 class="pv-drugs-header">Clinical trials of interest</h2>
  <table id="pv-trials-table">
     <thead>
      <tr>
          <th>Trial ID</th>
          <th>Title</th>
  