function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['African Invertebrates', 3],
    ['Annalen des kaiserlich-königlichen naturhistorischen Hofmuseums', 2],
    ['Annals of the Natal Museum', 1],
    ['Archiv für Molluskenkunde', 1],
    ['Hallageriis', 2],
    ['Journal of Natural History', 1],
    ['Journal of the Academy of Natural Sciences of Philadelphia', 2],
    ['Memoirs of the College of Science, Kyoto Imperial University, Series B', 1],
    ['Molluscan Research', 1],
    ['Paleontological Research', 1],
    ['Records of the Australian Museum', 4],
    ['Report on the Scientific Results of the Voyage of H. M. S. Challenger During the Years 1873 – 76, Zoology', 9],
    ['Transactions of the geological society of London, 2', 3],
    ['Zoosystema', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=32)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);