function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['American Museum Novitates', 3],
    ['Annalen des Naturhistorischen Museums in Wien, Serie B, Botanik und Zoologie', 1],
    ['Ecologica Montenegrina', 1],
    ['Hydrobiologia', 1],
    ['Invertebrate systematics', 1],
    ['Proceedings of the Academy of Natural Sciences of Philadelphia', 2],
    ['Records of the Zoological Survey of India', 1],
    ['Science Press', 2],
    ['Species Diversity', 3],
    ['ZooKeys', 2],
    ['Zoological Research', 1],
    ['Zoologische Jahrbücher, Abteilung für Systematik, Geographie und Biologie der Thiere', 1],
    ['Zoology in the Middle East', 1],
    ['Zootaxa', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=21)',
    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);