function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barker, David G. & Barker, Tracy M. & Davis, Mark A.', 1],
    ['Hoser, Raymond', 5],
    ['Jarvis, Charlie', 1],
    ['Nacoulma, Blandine M. I. & Schmidt, Marco & Hahn, Karen', 1],
    ['Schleip, Wulf D. & O\'Shea, Mark', 20],
    ['Szyndlar, Zbigniew & Georgalis, Georgios L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=29)',
    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);