function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bennett, B. A.', 1],
    ['Bleeker, Pieter', 2],
    ['Cocco, A.', 1],
    ['De Filippi, F.', 1],
    ['Fries, B. F.', 1],
    ['Gilchrist, J. D. F. & Thompson, W. Wardlaw', 8],
    ['Holleman, Wouter & Heyden, Sophie Von Der & Zsilavecz, Guido', 3],
    ['McKay, Roland J.', 1],
    ['Mocquard, F.', 1],
    ['Philippi, R. A.', 1],
    ['Reinhardt, J. C. H.', 1],
    ['Steindachner, F.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);