function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['C. Fritsch', 2],
    ['C. G. Proft, Fil. et Soc.', 9],
    ['Carolum Reichard', 1],
    ['Christ. Gottl. Proft', 1],
    ['Eberhard Klett et Franck', 12],
    ['Faunus (Gistel\'s)', 1],
    ['Felsecker', 1],
    ['H. Steiner und Comp.', 1],
    ['Io. Frid. Gleditsch', 1],
    ['Ioannis Thomae Trattner', 16],
    ['Journal of the proceedings of the Linnean Society, Zoology', 1],
    ['Kungliga Svenska Vetenskapsakademiens Handlingar', 2],
    ['Laurentii Salvii', 14],
    ['Officina Libraria Kortii', 3],
    ['Robson and Co.', 2],
    ['Other (2)', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=69)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);