function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Archiv für Zoologie und Zootomie', 7],
    ['Biodiversity Data Journal', 2],
    ['C. Fritsch', 1],
    ['Hallageriis', 2],
    ['K. Vetensk. Acad. N. Handl., Stockholm', 1],
    ['Laurentius Salvius', 3],
    ['Memoirs of the Wernerian Natural History Society', 1],
    ['Naturforscher (Halle)', 3],
    ['Transactions of the Linnean Society of London', 1],
    ['Vestnik Zoologii', 1],
    ['Zoodiversity', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);