function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['African Invertebrates', 1],
    ['Biodiversity Data Journal', 12],
    ['Japanese Journal of Zoology', 2],
    ['Journal of helminthology', 1],
    ['Proceedings of the Helminthological Society of Washington', 1],
    ['Records of the Indian Museum', 1],
    ['University of Wisconsin Studies in Science', 1],
    ['Vestnik Zoologii', 2],
    ['Zoodiversity', 6],
    ['Zoological Journal of the Linnean Society', 5],
    ['Zoopathologica', 3],
    ['Zootaxa', 24]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=59)',
    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);