function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annales de la Société Entomologique de France, Séries 1 - 6', 3],
    ['Annales du Musée Royal du Congo Belge, Série 8, Zoologiques', 1],
    ['Berliner Entomologische Zeitschrift', 1],
    ['Berliner entomologische Zeitschrift', 1],
    ['Bulletin de la Société Entomologique de France', 1],
    ['Bulletin of the United States National Museum', 1],
    ['Transactions of the Entomological Society of London', 1],
    ['ZooKeys', 29]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=38)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);