function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['A. W', 5],
    ['Cornalba, Maurizio & Quaranta, Marino & Selis, Marco', 1],
    ['Else, George R. & Bolton, Barry & Broad, Gavin R.', 2],
    ['Gibbs, Jason & Ascher, John S. & Rightmyer, Molly G.', 2],
    ['Panzer, Georg Wolfgang Franz', 1],
    ['Portman, Zachary M. & Gardner, Joel & Lane, Ian G.', 5],
    ['Risch, Stephan & Roberts, Stuart P. M. & Smit, Jan', 1],
    ['Schedl, Wolfgang', 2],
    ['Zettel, Herbert & Ockermüller, Esther & Schoder, Sabine', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);