function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['A. Frič', 2],
    ['Abhandlungen der Kaiserlich-Königlichen Geologischen Reichsanstalt, Wien', 1],
    ['American Museum Novitates', 7],
    ['Annales de la Société Geologique du Nord', 2],
    ['Annals and Magazine of Natural History, Including Zoology, Botany and Geology, Being a Continuation of the \' Magazine of Botany ', 4],
    ['Bulletin of the United States Geological Survey', 1],
    ['Geological Magazine', 2],
    ['Monographs of the Palaeontographical Society', 1],
    ['Proceedings of the American Academy of Arts and Sciences', 2],
    ['Sitzungsberichte der Königlich Böhmischen Gesellschaft der Wissenschaften, Mathematisch-Naturwissenschaftliche Klasse', 3],
    ['Zeitschrift der Deutschen Geologischen Gesellschaft', 1],
    ['Zoological Journal of the Linnean Society', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=28)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);