function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ardenghi, Nicola M. G. & Galasso, Gabriele & Banfi, Enrico', 10],
    ['Denk, Thomas & Sami, Marco & Teodoridis, Vasilis', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Info Flora', 6],
    ['Jarvis, Charlie', 5],
    ['Jeanmonod, Daniel', 3],
    ['Jeanmonod, Daniel & Schlüssel, André', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 3],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 4],
    ['Linnaeus, Carolus', 8],
    ['Ma, Zhi-Yao & Wen, Jun & Fu, Qiang & Liu, Xiu-Qun', 1],
    ['Mille, Christian & Henderson, Rosa C. & Cazères, Sylvie', 1],
    ['Suh, Soo-Jung', 1],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Wen, Jun & Ma, Zhi-Yao', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=49)',
    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);