function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 17],
    ['Desjardins, Émilie & Lai, Sandra & Payette, Serge & Dubé, Martin', 1],
    ['Doumas, Panayiotis & Goula, Katerina', 2],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 20],
    ['Info Flora', 21],
    ['Jarvis, Charlie', 16],
    ['Kapitonova, Olga A.', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 13],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 1],
    ['Li, Xin & Wang, Hong & Li, De-Zhu & Yu, Wen-Bin', 1],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Wittmann, H. & Hohla, M.', 1],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Turdiboev, Obidjon A. & Rouhan, Germinal & Allamurotov, Akmal L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=99)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);