function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahl, E.', 1],
    ['Burgess, W. E. & Axelrod, H. R.', 1],
    ['Eccles, D. H.', 1],
    ['Fryer, G.', 1],
    ['Johnson, D. S.', 1],
    ['Konings, A.', 2],
    ['Konings, Adrianus F. & Miller, Torin A. & Stauffer, Jay R.', 1],
    ['McKaye, K. R. & Stauffer, J. R.', 1],
    ['Meyer, M. K. & Foerster, W.', 1],
    ['Staeck, W.', 2],
    ['Stauffer Jr, J. R. & Konings, F. & Ryan, T. M.', 2],
    ['Stauffer, J. R.', 2],
    ['Çiçek, Erdoğan & Fricke, Ronald & Sungur, Sevil', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    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);