function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Burman, Nicolaas Laurens', 1],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 1],
    ['Diels, Friedrich Ludwig Emil', 1],
    ['Doffek, Benjamin & Huang, Yvonne & Huang, Yen-Hua', 2],
    ['Gibbs, Lilian Suzette', 1],
    ['Jarvis, Charlie', 3],
    ['Linnaeus, Carolus', 4],
    ['Nacoulma, Blandine M. I. & Schmidt, Marco & Hahn, Karen', 1],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Valeton, Theodoric', 1],
    ['Wijnands, Dirk Onno & Heniger, Johannes & Veldkamp, Jan Frederik', 1],
    ['Zhou, Ya-Dong & Amenu, Sara Getachew & Mwachala, Geoffrey', 1],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=26)',
    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);