function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Zoologica Academiae Scientiarum Hungaricae', 1],
    ['Annali del Museo Civico di Storia Naturale \' Giacomo Doria\'', 3],
    ['Biodiversity Data Journal', 6],
    ['Bulletin of the United States National Museum', 1],
    ['Deutsche Entomologische Zeitschrift', 5],
    ['Journal of Hymenoptera Research', 2],
    ['Journal of Natural History', 1],
    ['Linzer biologische Beiträge', 4],
    ['Transactions of the American Entomological Society', 1],
    ['ZooKeys', 4],
    ['Zoological Journal of the Linnean Society', 1],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=33)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);