function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annales du Musée de l\'Afrique Central, Series in- 8 °, Sciences Zoologiques', 1],
    ['Biodiversity Data Journal', 2],
    ['Centralblatt für Bakteriologie, Parasitenkunde und Infektionskrankheiten', 1],
    ['Japanese Journal of Zoology', 1],
    ['Philippine Journal of Science, Section D', 1],
    ['Proceedings of the Linnean Society of New South Wales', 2],
    ['Proceedings of the National Academy of Sciences, India, Section B, Biological Sciences', 1],
    ['Vestnik Ceskoslovenske Spolecnosti Zoologicke', 1],
    ['Zoodiversity', 1],
    ['Zoologische Jahrbucher, Abteilung für Systematik', 1],
    ['Zoologischer Anzeiger', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);