function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Biologica Venezuelica', 1],
    ['Biodiversity Data Journal', 5],
    ['Bulletin of the American Museum of Natural History', 2],
    ['Entomo Helvetica', 3],
    ['Fain et Compagnie', 1],
    ['Fragmenta entomologica', 3],
    ['Journal of Natural History', 2],
    ['Linzer biologische Beiträge', 1],
    ['Officina Libraria Kortii', 1],
    ['Supplementum Entomologiae systematicae', 3],
    ['Systematic Entomology', 1],
    ['The Ohio Journal of Science', 1],
    ['ZooKeys', 1],
    ['Zoosystema', 1],
    ['Zootaxa', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=33)',
    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);