function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmad, J.', 1],
    ['Aken\'Ova, Thelma & Cribb, Thomas & Bray, Rodney', 8],
    ['Aken’Ova, T. O. & Cribb, Thomas H. & Bray, Rodney A.', 5],
    ['Gupta, V. & Ahmad, J.', 1],
    ['Hafeezullah, M.', 1],
    ['Manter, Harold W.', 2],
    ['Martin, W. E.', 1],
    ['Parukhin, A M', 1],
    ['Rohner, Christoph Andreas & Cribb, Thomas H.', 1],
    ['Shen, J. - w.', 2],
    ['Shen, J. - w. & Tong, Yong-yong', 1],
    ['Toman, Gerd', 1],
    ['Yamaguti, S.', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);