function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmad, J.', 3],
    ['Barker, Stephen C. & Bray, Rodney A. & Cribb, Thomas H.', 1],
    ['Bray, Rodney A. & Cribb, Thomas H.', 3],
    ['Liu, Sheng-fa', 1],
    ['Madhavi, R.', 1],
    ['Pritchard, M. H.', 1],
    ['Toman, Gerd', 1],
    ['Wang, P. - q.', 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);