function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acarologia', 10],
    ['Acarological Studies', 2],
    ['Acta Zoologica Academiae Scientiarum Hungaricae', 16],
    ['African Invertebrates', 4],
    ['Journal of Natural History', 7],
    ['Opuscula Zoologica, Budapest', 1],
    ['Persian Journal of Acarology', 6],
    ['Proceedings of the Japanese Society of Systematic Zoology', 5],
    ['Revue suisse de Zoologie', 15],
    ['Spixiana', 1],
    ['Veröffentlichungen des Instituts für Meeresforschung Bremerhaven', 2],
    ['Vestnik Zoologii', 3],
    ['ZooKeys', 2],
    ['Zootaxa', 186]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=260)',
    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);