anchor.diff:          ageHistDTW.setDataMap(hist,['Age','# patients']);
           var column = new google.visualization.ColumnChart(document.getElementById(divId));
           var options = {
  -            title: 'Age distribution',
               hAxis: {title: 'Age at diagnosis'},
               vAxis: {title: '# of Patients'},
               legend: {position: 'none'}
           }
           column.draw(ageHistDTW.dataTable,options);
  +    }
  +    
  +    function plotPieChart(dt,col,divId) {
  +        var hist = calcHistogram(dt,col);
  +        var histHistDTW = new DataTableWrapper();
  +        histHistDTW.setDataMap(hist,[dt.getColumnLabel(col),'# patients']);
  +        var column = new google.visualization.PieChart(document.getElementById(divId));
  +        column.draw(histHistDTW.dataTable);
       }
       
       function calcHistogram(dt,col,bins) {
  
positive.code:             var caseMap = getCaseMap(dt);
              
              plotAgeHistogram(dt,headerMap['age_at_diagnosis'],'age-hist');
              
              var formatter = new google.visualization.PatternFormat(formatPatientLink('{0}'));
              formatter.format(dt, [0]);
  
negative.code:     <tr>
          <td>
              <fieldset>
                  <legend style="color:blue;font-weight:bold;">Age Distributions</legend>
                  <div id="age-hist" style="width:300px;height:200px;display:block;">
                      <img src="images/ajax-loader.gif"/>
                  </div>
              </fieldset>
          </td>
          <td>
              <fieldset>
                  <legend style="color:blue;font-weight:bold;">Histology</legend>
                  <div id="hist-pie" style="width:300px;height:200px;display:block;">
                      <img src="images/ajax-loader.gif"/>
                  </div>
              </fieldset>
          </td>
          <td rowspan="2">
              <fieldset>
                  <legend style="color:blue;font-weight:bold;">Mutation Count VS. Copy Number Alteration Fraction</legend>
                  <div id="scatter-plot" style="width:430px;height:430px;display:block;">
                      <img src="images/ajax-loader.gif"/>
                  </div>
              </fieldset>
          </td>
      </tr>
      <tr>
          <td>
              <fieldset>
                  <legend style="color:blue;font-weight:bold;">Stage</legend>
                  <div id="stage-pie" style="width:300px;height:200px;display:block;">
                      <img src="images/ajax-loader.gif"/>
                  </div>
              </fieldset>
          </td>
          <td>
              <fieldset>
                  <legend style="color:blue;font-weight:bold;">Grade</legend>
                  <div id="grade-pie" style="width:300px;height:200px;display:block;">
                      <img src="images/ajax-loader.gif"/>
                  </div>
              </fieldset>
          </td>
      </tr>
      
  </table>
  
  