function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Doumas, Panayiotis & Goula, Katerina', 1],
    ['Fei, Wen-Qun & Li, Hui-Min & Ren, Chen & Yang, Qin-Er', 2],
    ['Jarvis, Charlie', 11],
    ['Jung, Stefanie & Lauter, Jan & Hartung, Nicole M. & These, Anja', 2],
    ['Mosyakin, Sergei L. & Shiyan, Natalia M. & Hodálová, Iva', 1],
    ['Sutorý, Karel', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);