function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 8],
    ['E. W. Janson', 20],
    ['Entomologist\'s monthly magazine', 10],
    ['Fragmenta entomologica', 1],
    ['Journal of Hymenoptera Research', 1],
    ['Linzer biologische Beiträge', 224],
    ['Proceedings of the Hawaiian Entomological Society', 6],
    ['Proceedings of the Literary and Philosophical Society of Manchester', 8],
    ['Proceedings of the Manchester Literary and Philosophical Society', 2],
    ['The Journal of the Linnean Society of London, Zoology', 1],
    ['Transactions of the Entomological Society of London', 9],
    ['Voyage de la corvette l\'Astrolabe: exécuté par ordre du roi, pendant les années 1826 - 1827 - 1828 - 1829', 1],
    ['Wien Ent Ztg', 2],
    ['Wiener entomologische Zeitung', 1],
    ['Zootaxa', 34]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=328)',
    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);