function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bailey, R. G. & Matthes, H.', 1],
    ['Boulenger, George Albert', 1],
    ['Fowler, Henry Weed', 1],
    ['Günther, Albert Charles Lewis Gotthilf', 1],
    ['Nichols, J. T. & Griscom, L.', 1],
    ['Riddin, Megan A. & Bills, I. Roger & Villet, Martin H.', 5],
    ['Worthington, E. B.', 1],
    ['van der Horst, C. J.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);