function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Societatis Regiae Scientiarum Indo-Neêrlandicae', 1],
    ['Archiv für Naturgeschichte', 1],
    ['Ber. Mitth. Freund. Naturw., Haidinger', 1],
    ['F. S. Hübschmann, Monachii [= Munich] & Fleischer, Lipsiae [= Leipzig]', 1],
    ['Förh. Skand. Naturf.', 1],
    ['Mémoires Présentés à l\'Académie Impériale des Sciences de St. Pétersbourg par Divers Savants, et lus dans ses Assemblées', 2],
    ['Natuurkunde Tijdschrift voor Nederlandsche-Indië', 6],
    ['Proc. - Verb. Soc. Tosc. Sci. Nat.', 1],
    ['Proceedings of the Zoological Society of London, B', 4],
    ['Report of the British Association for the Advancement of Science', 1],
    ['Salviucci', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);