function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Archiv für Molluskenkunde', 4],
    ['Geodiversitas', 1],
    ['Iheringia, Série Zoologia', 4],
    ['Journal of Molluscan Studies', 1],
    ['Journal of Natural History', 7],
    ['Proceedings of the Boston Society of Natural History', 1],
    ['Raffles Bulletin of Zoology', 44],
    ['Ruthenica, Russian Malacological Journal', 2],
    ['Vernate', 2],
    ['ZooKeys', 96],
    ['Zoosystema', 3],
    ['Zoosystematics and Evolution', 2],
    ['Zootaxa', 32]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=199)',
    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);