function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Actes de la Société Linnéenne de Bordeaux', 1],
    ['Atti della Accademia Pontaniana', 1],
    ['Bolletino della Societa geologica italiana', 2],
    ['Bulletin of the United States National Museum', 2],
    ['Journal of systematic palaeontology', 2],
    ['Mississippi Geology', 1],
    ['Nouvelles Archives du Muséum d\'histoire Naturelle', 1],
    ['Proceedings of the United States National Museum', 1],
    ['Zeitschrift der Deutschen Geologischen Gesellschaft', 1],
    ['ZooKeys', 1],
    ['Zoological Journal of the Linnean Society', 3],
    ['Zoologische Jahrbücher, Abteilung für Systematik, Ökologie und Geographie der Tiere', 1],
    ['Zootaxa', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=23)',
    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);