function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chao, Chien-Ti & Huang, Bing-Hong & Chang, Jui-Tse', 1],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 6],
    ['Info Flora', 5],
    ['Jarvis, Charlie', 13],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 3],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 4],
    ['Massoud Ranjbar & Chonour Mahmoudi & Laurent Gautier', 1],
    ['Rolfe, Robert Allen', 1],
    ['Sosef, Marc S. M. & Meerts, Pierre', 1],
    ['Tan, Lu & Xiang, Xiao-Mei & Liu, Bing & Wang, Zhi-Cheng', 1],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Yildirim, Hasan & Çiçek, Mehmet & Akbaş, Kenan & Şeker, Erkan', 1],
    ['Zhao, Yue & Turginov, Orzimat T. & Turdiboev, Obidjon A.', 1],
    ['Çiçek, Mehmet & Yaprak, Ahmet Emre', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=42)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);