function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alderwerelt van Rosenburgh, Capt. C. R. W. K.', 1],
    ['Engler, Heinrich Gustav Adolf', 1],
    ['Engler, Heinrich Gustav Adolf & Krause, Johann Wilhelm', 7],
    ['Hay, William Perry', 10],
    ['Herscovitch, C. & Hay, William Perry', 1],
    ['Ridley, Henry Nicholas', 4],
    ['Schott, Henrico & Endlicher, Stephan Friedrich Ladislaus', 1],
    ['Wong, Sin Yeng & Joling, Jyloerica', 11]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=36)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);