function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 1],
    ['Check List', 2],
    ['European Journal of Taxonomy', 31],
    ['Helgoländer Wissenschaftliche Meeresuntersuchungen', 1],
    ['Journal of Natural History', 30],
    ['Papers from the Tortugas Laboratory of the Carnegie Institute of Washington', 1],
    ['Revue suisse de Zoologie', 2],
    ['Species Diversity', 6],
    ['ZooKeys', 9],
    ['Zoological Journal of the Linnean Society', 34],
    ['Zoological Science', 12],
    ['Zoological Systematics', 7],
    ['Zoologischer Anzeiger', 1],
    ['Zoosystema', 2],
    ['Zootaxa', 388]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=527)',
    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);