function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Zoologica Academiae Scientiarum Hungaricae', 3],
    ['Acta Zootaxonomica Sinica', 7],
    ['African Invertebrates', 2],
    ['African invertebrates', 1],
    ['Annales de la Société Entomologique de France, Séries 1 - 6', 1],
    ['Biodiversity Data Journal', 3],
    ['Bulletin of the American Museum of Natural History', 20],
    ['Bulletin of the National Museum of Nature and Science, Series A (Zoology)', 1],
    ['European Journal of Taxonomy', 57],
    ['Journal of Natural History', 15],
    ['Vestnik Zoologii', 1],
    ['ZooKeys', 20],
    ['Zoological Systematics', 2],
    ['Zoosystema', 1],
    ['Zootaxa', 41]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=175)',
    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);