function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abhandlungen der Akademie der Wissenschaften der München Mathematik-Physikalische Klasse', 1],
    ['Biodiversity Data Journal', 3],
    ['Boletim da Sociedade de Geografia de Lisboa, 6', 1],
    ['Bulletin of the United States National Museum', 1],
    ['Comptes Rendus de l’Academie des Sciences de Paris, 3', 10],
    ['European Journal of Taxonomy', 6],
    ['Journal of Natural History', 2],
    ['Laurentius Salvius', 3],
    ['Nova Acta Academiae Scientiarum Imperialis Petropolitana', 1],
    ['Occasional Papers of the Bernice P. Bishop Museum', 1],
    ['Proceedings of the Zoological Society of London, B', 2],
    ['Sanfilippo', 1],
    ['Schmerber', 1],
    ['Transactions of the Linnean Society of London', 1],
    ['Zootaxa', 22]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=56)',
    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);