function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Liston, A. D. & Knight, G. T. & Heibo, E. & Bland, K. P.', 1],
    ['Liston, Andrew & Prous, Marko & Macek, Jan', 3],
    ['Liston, Andrew & Prous, Marko & Vårdal, Hege', 16],
    ['Liston, Andrew D.', 1],
    ['Liston, Andrew D. & Jacobs, Hans-Joachim & Prous, Marko', 2],
    ['Liston, Andrew D. & Knight, Guy T. & Sheppard, David A.', 18],
    ['Liston, Andrew D. & Prous, Marko', 1],
    ['Schedl, W.', 9],
    ['Schedl, Wolfgang', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=59)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);