function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Christ. Gottl. Proft', 1],
    ['Edinburgh encyclopaedia, conducted by David Brewster', 1],
    ['Geodiversitas', 3],
    ['Gottlieb August Lange', 1],
    ['Ioannis Thomae Trattner', 1],
    ['Laurentius Salvius', 60],
    ['Mich. Friedr. Bartsch', 1],
    ['Mölleri apud Heineck et Faber', 1],
    ['Officina Libraria Kortii', 5],
    ['Proft et Storch', 3],
    ['Transactions of the Linnean Society of London', 3],
    ['Zoological Journal of the Linnean Society', 1],
    ['Zootaxa', 32],
    ['[G. Remondini e fl.]', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=114)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);