function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barnard, Keppel Harcourt', 1],
    ['Bleeker, Pieter', 1],
    ['Cadenat, J. & Roux, C.', 1],
    ['Eigenmann, C. H.', 1],
    ['Gilbert, Charles H.', 1],
    ['Goode, G. B. & Bean, T. H.', 2],
    ['Kner, R. & Steindachner, F.', 1],
    ['Norman, J. R.', 1],
    ['Osório, B.', 1],
    ['Peters, Wilhelm Carl Hartwig', 2],
    ['Roux, C.', 1],
    ['Steindachner, F.', 1],
    ['Tanaka, Shigeho', 1],
    ['Weber, M.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);