function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 4],
    ['Eberhard Klett et Franck', 1],
    ['Io. Frid. Gleditsch', 1],
    ['Ioannis Thomae Trattner', 1],
    ['Journal and Proceedings of the Linnean Society of London, Zoology', 3],
    ['L. Salvius', 1],
    ['Laurentii Salvii', 2],
    ['Laurentius Salvius', 16],
    ['Proceedings of the Entomological Society of Washington', 1],
    ['Siegfried Lebrecht Crusius', 3],
    ['Transactions of the American Entomological Society', 1],
    ['Zoosystema', 1],
    ['Zootaxa', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=41)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);