function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Societatis Regiae Scientiarum Indo-Neêrlandicae', 1],
    ['American Museum Novitates', 1],
    ['Annales du Musée du Congo Belge, Série 1, Zoologiques', 4],
    ['Archiv für Naturgeschichte', 1],
    ['Blätter für Aquarien- und Terrarien-Kunde', 1],
    ['Bulletin de la Société Zoologique de France', 1],
    ['Natuurkunde Tijdschrift voor Nederlandsche-Indië', 3],
    ['Proceedings of the Academy of Natural Sciences of Philadelphia', 1],
    ['Proceedings of the Zoological Society of London, B', 2],
    ['Raffles Bulletin of Zoology', 1],
    ['Wochenschrift für Aquarien- und Terrarienkunde', 1],
    ['Zootaxa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);