function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abhandlungen Naturwissenschaftlichen Vereins zu Hamburg', 1],
    ['Archiv für Naturgeschichte', 2],
    ['Bulletin Zool. Surv. India', 1],
    ['Bulletin of the Biology Department, Science College, Sun Yatsen University', 1],
    ['Bulletin of the United States National Museum', 1],
    ['Check List', 1],
    ['Journal of Natural History', 1],
    ['Nederlandsch Tijdschrift voor de Dierkunde', 1],
    ['Notulae Naturae', 1],
    ['Philippine Journal of Science, Section D', 1],
    ['Proceedings of the Academy of Natural Sciences of Philadelphia', 1],
    ['Proceedings of the United States National Museum, 3', 1],
    ['Special Bulletin of the United States National Museum', 1],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);