function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Beiträge Zur Entomologie = Contributions to Entomology', 5],
    ['Biodiversity Data Journal', 8],
    ['C. G. Proft, Fil. et Soc.', 11],
    ['Carolum Reichard', 4],
    ['E. W. Janson', 3],
    ['Entomologist\'s monthly magazine', 1],
    ['Journal of Natural History', 1],
    ['Linzer biologische Beiträge', 1],
    ['Officina Libraria Kortii', 5],
    ['Proceedings of the Literary and Philosophical Society of Manchester', 3],
    ['Proceedings of the Manchester Literary and Philosophical Society', 1],
    ['Proft et Storch', 4],
    ['The Journal of the Linnean Society of London, Zoology', 1],
    ['Transactions of the Entomological Society of London', 1],
    ['Zootaxa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=51)',
    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);