function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alleyne, H. G. & Macleay, William John', 1],
    ['Andréfouët, Serge & Chen, Wei-Jen & Kinch, Jeff & Mana, Ralph', 2],
    ['Bennett, Edward Turner', 1],
    ['Bleeker, Pieter', 3],
    ['Bliss, R.', 1],
    ['Bogorodsky, Sergey V. & Alpermann, Tilman J. & Mal, Ahmad O.', 1],
    ['Boulenger, George Albert', 1],
    ['Day, F.', 1],
    ['Fourmanoir, Pierre', 2],
    ['Günther, Albert Charles Lewis Gotthilf', 1],
    ['Klunzinger, C. B.', 2],
    ['Macleay, William John', 3],
    ['Montrouzier, X.', 3],
    ['Peters, Wilhelm Carl Hartwig', 2],
    ['Rüppell, Wilhem Peter Eduard Simon', 3],
    ['Other (3)', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    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);