function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['A. Koenig', 2],
    ['Bulletin of the American Museum of Natural History', 1],
    ['Geodiversitas', 8],
    ['Herpetozoa', 2],
    ['Laurentii Salvii', 1],
    ['Laurentius Salvius', 12],
    ['London', 1],
    ['Megataxa', 17],
    ['Panckoucke', 5],
    ['Proceedings of the California Academy of Sciences, Series 4', 4],
    ['The American Geologist', 1],
    ['Zoodiversity', 1],
    ['Zootaxa', 12]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=67)',
    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);