function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahrens, Dirk & Bezděk, Aleš', 3],
    ['Ahrens, Dirk & Liu, Wangang & Lukic, Daniel & Bai, Ming', 20],
    ['Ahrens, Dirk & Pacholátko, Petr', 18],
    ['Ahrens, Dirk & Pham, Phu', 17],
    ['Bezděk, Aleš & Hájek, Jiří & Ascr, Biology Centre', 3],
    ['Liu, Wan-Gang & Ahrens, Dirk & Bai, Ming & Yang, Xing-Ke', 15],
    ['Liu, Wan-Gang & Bai, Ming & Yang, Xing-Ke & Ahrens, Dirk', 25],
    ['Zhao, Ming-Zhi & Ahrens, Dirk', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=105)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);