function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Butler, L. S. G.', 1],
    ['Forster, Raymond Robert', 2],
    ['Penney, David & Dierick, Manuel & Cnudde, Veerle', 2],
    ['Rix, Michael & Harvey, Mark', 78],
    ['Rix, Michael G. & Harvey, Mark S.', 1],
    ['Rix, Michael G. & Harvey, Mark S. & Roberts, J. D.', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=90)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);