function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annales de la Faculte des Sciences du Cameroun', 1],
    ['Archiv für Protistenkunde', 1],
    ['Journal of Eukaryotic Microbiology', 1],
    ['Journal of Morphology', 1],
    ['Journal of Natural History', 4],
    ['Journal of Protozoology', 1],
    ['Journal of Species Research', 2],
    ['Matematikai és Természettudományi Értesítő', 1],
    ['Mémoires du Muséum national d\'Histoire naturelle', 2],
    ['The American Naturalist', 1],
    ['The Biological Bulletin', 1],
    ['Transactions of the American Microscopical Society', 5],
    ['Wilhelm Engelmann', 1],
    ['Zoologicheskii Zhurnal', 4],
    ['Zootaxa', 18]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=44)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);