function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 9],
    ['European Journal of Taxonomy', 21],
    ['Iheringia, Serie Zoologia', 1],
    ['Journal of Natural History', 8],
    ['Neotropical Biology and Conservation', 7],
    ['Oregon State Monographs Studies in Zoology', 1],
    ['PeerJ', 4],
    ['Proceedings of the Zoological Society of London', 1],
    ['Revue Suisse de Zoologie', 20],
    ['Verlag von Wilhelm Engelmann', 5],
    ['ZooKeys', 16],
    ['Zoosystema', 2],
    ['Zootaxa', 361]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=456)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);