function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Anzeiger', 1],
    ['Bulletin of the United States Fish Commission', 1],
    ['Bulletin of the United States National Museum', 1],
    ['European Journal of Taxonomy', 1],
    ['Indo-Pacific Fishes', 5],
    ['Jahrbuch der Hamburgischen Wissenschaftlichen Anstalten', 1],
    ['Journal of the Ocean Science Foundation', 1],
    ['Laurentius Salvius', 1],
    ['Natuurkundige Verhandelingen van de Hollandsche Maatschappij der Wetenschappen te Haarlem, Series 2', 1],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 1],
    ['Pacific Science', 3],
    ['Phytotaxa', 2],
    ['Proceedings of the Linnean Society of New South Wales', 6],
    ['Voorst', 1],
    ['Zootaxa', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);