anchor.diff:          <td>
               <fieldset>
                   <legend style="color:blue;font-weight:bold;">Histograms</legend>
  -                <div id="histogram" style="width:500px;height:400px;display:block;">
  +                <div id="age-hist" style="width:500px;height:400px;display:block;">
                       <img src="images/ajax-loader.gif"/>
                   </div>
               </fieldset>
  
positive.code:             var headerMap = getHeaderMap(dt);
              var caseMap = getCaseMap(dt);
              
              var formatter = new google.visualization.PatternFormat(formatPatientLink('{0}'));
              formatter.format(dt, [0]);
              
              var tableDataView = new google.visualization.DataView(dt);
              //tableDataView.setColumns([0,1,2]);
              var table = new google.visualization.Table(document.getElementById('clinical-data-table'));
              table.draw(tableDataView,{allowHtml: true, showRowNumber: true});
              
  
negative.code:         }
          return ix;
      }
      
      function plotAgeHistogram(dt,col,divId) {
          var bins = [20,30,40,50,60,70,80];
          var hist = calcHistogram(dt,col,bins);
          var ageHistDTW = new DataTableWrapper();
          ageHistDTW.setDataMap(hist,['Age','# patients']);
          var column = new google.visualization.ColumnChart(document.getElementById(divId));
          column.draw(ageHistDTW.dataTable);
      }
      
      function calcHistogram(dt,col,bins) {
          var hist = {};
          var rows = dt.getNumberOfRows();
          var t = dt.getColumnType(col);
          if (t=="number") {
              if (bins==null) bins = 10;
              if ((typeof bins)==(typeof 1)) {
                  var r = getColumnRange(col);
                  var step = (r.max-r.min)/(bins-1);
                  bins = [];
                  for (var i=0; i<bins-1; i++) {
                      bins.push(r.min+i*step);
                  }
              }
              
              var count = [];
              for (var i=0; i<=bins.length; i++) {
                  count.push(0);
              }
              
              for (var r=0; r<rows; r++) {
                  var v = dt.getValue(r,col);
                  var low = 0, high = bins.length, i;
                  while (low <= high) {
                      i = Math.floor((low + high) / 2); 
                      if (bins[i] >= v)  {high = i - 1;}
                      else {low = i + 1;}
                  }
                  count[low] = count[low]+1;
              }
              
              hist['<='+bins[0]] = count[0];
              var i=1;
              for (; i<bins.length; i++) {
                  hist[bins[i-1]+'~'+bins[i]] = count[i];
              }
              hist['>'+bins[bins.length-1]] = count[i];
          } else {
              for (var r=0; r<rows; r++) {
                  var v = dt.getValue(r,col);
                  if(v!=null)
                      hist[v] = hist[v] ? hist[v]+1 : 1;
              }
          }
          return hist;
      }
  </script>
  
  <div>
  