function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['C. Fritsch', 2],
    ['Carolum Reichard', 1],
    ['Christ. Gottl. Proft', 1],
    ['Eberhard Klett et Franck', 3],
    ['Eberhardi Klett et Franck', 1],
    ['Ioannis Gottlob Rothe', 1],
    ['Ioannis Thomae Trattner', 8],
    ['Laurentii Salvii', 1],
    ['Laurentius Salvius', 40],
    ['Zootaxa', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=64)',
    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);