function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ayres, W. O.', 1],
    ['Bennett, Edward Turner', 7],
    ['Bleeker, Pieter', 6],
    ['Girard, Charles Frédéric', 1],
    ['Günther, Albert Charles Lewis Gotthilf', 1],
    ['Klunzinger, C. B.', 1],
    ['Lesson, René Primavère', 2],
    ['Lowe, R. T.', 2],
    ['Montrouzier, X.', 2],
    ['Richardson, John', 2],
    ['Rüppell, Wilhem Peter Eduard Simon', 1],
    ['Schmidt, P. J.', 1],
    ['Schomburgk, R. H.', 1],
    ['Seale, A.', 1],
    ['Smith, R. & Swain, J.', 2],
    ['Other (2)', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=33)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);