function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dictionnaire des Sciences Naturelles', 1],
    ['Johan Christi. Trappii', 1],
    ['Johan. Christi. Trappii', 3],
    ['Journal of the Academy of Natural Sciences of Philadelphia', 5],
    ['K. K. Hof-naturalien-cabinet', 1],
    ['Kansas University Geological Survey', 6],
    ['Laurentius Salvius', 9],
    ['Quarterly Journal of the Geological Society, London', 8],
    ['Skinner and Co.', 1],
    ['Transactions and Proceedings of the Palaeotological Society of Japan, New Series', 1],
    ['Transactions of the geological society of London, 2', 3],
    ['ZooKeys', 2],
    ['Zootaxa', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=56)',
    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);