function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annalen des Naturhistorischen Museums in Wien', 4],
    ['Arch. Zool. Anat. Fisiol., Genova, 2', 1],
    ['Archiv für Naturgeschichte', 1],
    ['Check List', 1],
    ['Eawag: Swiss Federal Institute of Aquatic Science and Technology', 1],
    ['Nouveaux Mémoires de la Société Impériale des Naturalistes de Moscou', 1],
    ['Report of the British Association for the Advancement of Science', 1],
    ['The Journal of the Linnean Society of London, Zoology', 1],
    ['Turkish Journal of Zoology', 1],
    ['Zootaxa', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);