function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Parasitologica', 1],
    ['Berlin', 1],
    ['Bulletin of the National Science Museum, Series A (Zoology)', 1],
    ['Hayez', 1],
    ['Indian Journal of Helminthology', 2],
    ['Parasite', 1],
    ['Parasites & Vectors', 1],
    ['Proceedings of the Helminthological Society of Washington', 2],
    ['Raffles Bulletin of Zoology', 2],
    ['Species Diversity', 2],
    ['Vestnik Zoologii', 1],
    ['ZooKeys', 38],
    ['Zoosystema', 95],
    ['Zootaxa', 32]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=180)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);