function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Societatis Regiae Scientiarum Indo-Neêrlandicae', 1],
    ['Annale van die Suid-Afrikaanse Museum [Annals of the South African Museum]', 1],
    ['Memoirs of the Indian Museum', 1],
    ['Natuurkunde Tijdschrift voor Nederlandsche-Indië', 6],
    ['Proceedings of the Royal Society of Queensland', 2],
    ['Proceedings of the United States National Museum, 3', 2],
    ['Proceedings of the Zoological Society of London, B', 1],
    ['The Journal of the Indian Archipelago and Eastern Asia', 1],
    ['Zoologische Mededelingen, Leiden', 1],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);