function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['A. Bertrand', 2],
    ['African Invertebrates', 1],
    ['American Journal of Conchology', 1],
    ['Archiv für Naturgeschichte', 1],
    ['Journal of Natural History', 5],
    ['Le Naturaliste', 1],
    ['Parasites & Vectors', 1],
    ['Proceedings of the American Philosophical Society', 1],
    ['University Press', 1],
    ['Vestnik Zoologii', 3],
    ['ZooKeys', 2],
    ['Zoosystema', 2],
    ['Zootaxa', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=24)',
    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);