function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annales de la Societe Entomologique de Belgique', 2],
    ['Belgian Journal of Entomology', 1],
    ['Bulletin de la Societe Vaudoise des Sciences Naturelles', 1],
    ['Deutsche Entomologische Zeitschrift', 1],
    ['Papéis Avulsos de Zoologia', 1],
    ['Reise in Ostafrika in den Jahren 1903 - 1905 mitteln der Hermann und Elise geb. Heckmann Wentzel-Stiftung ausgeführt von Profess', 1],
    ['Transactions of the Entomological Society of London', 2],
    ['ZooKeys', 5],
    ['Zootaxa', 26]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);