function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['American Museum Novitates', 1],
    ['Biodiversity Data Journal', 2],
    ['Bulletin of the British Museum (Natural History), Zoology Series', 1],
    ['Evolutionary Systematics', 2],
    ['Invertebrate systematics', 1],
    ['Public Library of Science, ONE', 1],
    ['Records of the Zoological Survey of India', 1],
    ['Species Diversity', 1],
    ['Transactions of the Linnean Society of London, Second Series. Zoology', 1],
    ['ZooKeys', 8],
    ['Zoological Science', 2],
    ['Zoosystematics and Evolution', 5],
    ['Zootaxa', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=27)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);