function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 8],
    ['Bulletin of the National Museum of Nature and Science. Series A, Zoology', 2],
    ['Communications biology', 2],
    ['Deutsche Entomologische Zeitschrift', 2],
    ['European Journal of Taxonomy', 19],
    ['Fossil Record', 6],
    ['Journal of Hymenoptera Research', 5],
    ['Journal of Species Research', 12],
    ['Kongl. Vetenskaps Academiens Handlingar', 1],
    ['Linzer biologische Beiträge', 14],
    ['Natural History Sciences', 1],
    ['Trustees of the British Museum', 1],
    ['Zootaxa', 56]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=129)',
    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);