function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Essl, F. & Stöhr, O.', 2],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 4],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Hirota, Shun K. & Yahara, Tetsukazu & Fuse, Kengo', 5],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 2],
    ['Info Flora', 7],
    ['Jarvis, Charlie', 4],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 10],
    ['Linnaeus, Carolus', 3],
    ['Nearns, Eugenio H. & Maier, Crystal A.', 2],
    ['Nearns, Eugenio H. & Tavakilian, Gérard L.', 2],
    ['Nearns, Eugenio H. & Tavakilian, Gérard-Luc', 3],
    ['Samain, Marie-Stephanie & Granados Mendoza, Carolina', 9],
    ['Xu, Song-Zhi & Gan, Qi-Liang & Li, Zhen-Yu', 3],
    ['Other (11)', 12]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=72)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);