function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['African Invertebrates', 1],
    ['American Journal of Conchology', 2],
    ['European Journal of Taxonomy', 2],
    ['Geodiversitas', 2],
    ['Georg, Libraire-éditeur', 1],
    ['Johan Christi. Trappii', 1],
    ['Journal of Natural History', 3],
    ['Longman, Orme, Brown, Green & Longmans', 1],
    ['Nautilus', 1],
    ['Quarterly Journal of the Geological Society, London', 3],
    ['ZooKeys', 7],
    ['Zoological Journal of the Linnean Society', 8],
    ['Zoosystema', 2],
    ['Zoosystematics and Evolution', 3],
    ['Zootaxa', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=45)',
    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);