function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 4],
    ['Fragmenta entomologica', 2],
    ['Io. Frid. Gleditsch', 4],
    ['Laurentius Salvius', 19],
    ['Librairie Encyclopedique de Roret', 2],
    ['Linzer biologische Beiträge', 2],
    ['Monographie des Libellulidées d\'Europe', 2],
    ['Proceedings of the Royal Entomological Society of London', 2],
    ['Proft et Storch', 2],
    ['Siegfried Lebrecht Crusius', 2],
    ['Supplementum Entomologiae systematicae', 9],
    ['Transactions of the Entomological Society of London', 2],
    ['Wiener Entomologische Monatschrift', 18],
    ['ZooKeys', 2],
    ['Zootaxa', 4],
    ['Other (8)', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=84)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);