function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 2],
    ['Denkschriften der Kaiserlichen Akademie der Wissenschaften, Wien', 2],
    ['Ichthyological Exploration of Freshwaters', 1],
    ['Memoirs of the Carnegie Museum', 1],
    ['Neotropical Ichthyol.', 1],
    ['Neotropical Ichthyology', 21],
    ['Occasional Papers of the Museum of Zoology, University of Michigan', 1],
    ['Proceedings of the California Academy of Sciences, Series 2', 1],
    ['Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaften Classe', 1],
    ['University of Kentucky', 1],
    ['Zoologische Mededelingen, Leiden', 2],
    ['Zoologische Verhandelingen, Leiden', 1],
    ['Zoologischer Anzeiger', 1],
    ['Zoosystema', 1],
    ['Zootaxa', 28]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=65)',
    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);