function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['American Museum Novitates', 15],
    ['Biodiversity Data Journal', 4],
    ['Bulletin of the American Museum of Natural History', 5],
    ['Check List', 1],
    ['Entomo Helvetica', 1],
    ['European Journal of Taxonomy', 1],
    ['Journal of Natural History', 6],
    ['Journal of Species Research', 1],
    ['Linzer biologische Beiträge', 17],
    ['MycoKeys', 31],
    ['Mémoires du Muséum national d\'Histoire naturelle', 8],
    ['Phytotaxa', 18],
    ['Records of the Australian Museum', 4],
    ['Zoological Journal of the Linnean Society', 1],
    ['Zootaxa', 454]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=567)',
    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);