function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Anzeiger', 1],
    ['Bulletin de la Société Philomathique de Paris, Série 7', 1],
    ['Comunicaciones del Museo Nacional de Buenos Aires', 1],
    ['F. S. Hübschmann, Monachii [= Munich] & Fleischer, Lipsiae [= Leipzig]', 1],
    ['Monatsberichte der Akademie der Wissenschaft zu Berlin', 2],
    ['Proceedings of the Academy of Natural Sciences of Philadelphia', 3],
    ['Proceedings of the American Philosophical Society', 1],
    ['Proceedings of the California Academy of Sciences, Series 2', 1],
    ['Revue et Magasin de Zoologie, Série 2', 1],
    ['Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaften Classe', 9]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=21)',
    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);