function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bibliopolii Academici Novi', 1],
    ['C. Fritsch', 1],
    ['Felsecker', 1],
    ['Journal of the Academy of Natural Sciences of Philadelphia', 1],
    ['Laurentii Salvii', 3],
    ['Laurentius Salvius', 25],
    ['Linzer biologische Beiträge', 1],
    ['Officina Lewerentziana', 1],
    ['Typis Hæredum Widmanstadii', 1],
    ['ZooKeys', 1],
    ['Zoological Systematics', 2],
    ['Zootaxa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);