function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Indian Journal of Helminthology', 1],
    ['Journal of Natural History', 26],
    ['Journal of helminthology', 2],
    ['PeerJ', 7],
    ['Raffles Bulletin of Zoology', 4],
    ['Species Diversity', 5],
    ['Systematic Parasitology', 8],
    ['ZooKeys', 1],
    ['Zoologia', 3],
    ['Zoological Science', 1],
    ['Zoosystema', 168],
    ['Zootaxa', 52]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=278)',
    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);