function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bol. Soc. Nac. Agric., Rio de Janeiro [Lavoura]', 1],
    ['Longman’s', 1],
    ['Monographs of the Academy of Natural Sciences of Philadelphia', 1],
    ['Natuurkunde Tijdschrift voor Nederlandsche-Indië', 1],
    ['Nederlandsch Tijdschrift voor de Dierkunde', 1],
    ['Proceedings of the Linnean Society of New South Wales', 1],
    ['Proceedings of the United States National Museum, 3', 1],
    ['Records of the Australian Museum', 1],
    ['Revue et Magasin de Zoologie, Série 3', 2],
    ['Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=11)',
    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);