function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Biologica Sibirica', 1],
    ['Biodiversity Data Journal', 2],
    ['Bulletin of the American Museum of Natural History', 1],
    ['Bulletin of the National Science Museum, Series A (Zoology)', 1],
    ['Deutsche Entomologische Zeitschrift', 2],
    ['European Journal of Taxonomy', 39],
    ['Insecta Mundi', 6],
    ['Journal of Orthoptera Research', 20],
    ['Proceedings of the Japanese Society of Systematic Zoology', 1],
    ['Zoological Systematics', 21],
    ['Zoosystema', 108],
    ['Zootaxa', 518]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=720)',
    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);