function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Banister, K. E.', 3],
    ['Banister, K. E. & Bailey, R. G.', 1],
    ['Banister, K. E. & Poll, M.', 2],
    ['Battalgil, F.', 1],
    ['Boulenger, George Albert', 1],
    ['Chang, H. - W.', 1],
    ['Derjavin, A. N.', 1],
    ['Hankó, B.', 1],
    ['Holly, M.', 3],
    ['Matthes, M.', 1],
    ['Nichols, J. T.', 3],
    ['Nichols, J. T. & Pope, C. H.', 1],
    ['Pellegrin, J.', 3],
    ['Pellegrin, J. & Chevey, P.', 1],
    ['Tweddle, D. & Skelton, P. H.', 2],
    ['Other (9)', 9]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    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);