function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dale E. Greenwalt & Daniel J. Bickel & Peter H. Kerr', 1],
    ['Dong, Qibiao & Pang, Baoping & Yang, Ding', 6],
    ['Grimaldi, David A.', 1],
    ['Meigen, Johann Wilhelm', 10],
    ['Panzer, Georg Wolfgang Franz', 1],
    ['Peter Zwick', 1],
    ['Rotheray, Graham & Lyszkowski, Richard', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);