function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['F. A. Brockhaus', 2],
    ['Proceedings of the Boston Society of Natural History', 2],
    ['Proceedings of the Zoological Society of London', 6],
    ['Reeve & Benham', 1],
    ['Revue suisse de Zoologie', 56],
    ['The American Journal of Science and Arts, Series 2', 1],
    ['The Journal of the Asiatic Society of Bengal', 1],
    ['Wolfgang Gerle', 1],
    ['ZooKeys', 453],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=527)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);