function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abotsi, Komla Elikplim & Kokou, Kouami & Dubuisson, Jean-Yves', 2],
    ['Bubík, Miroslav & Doláková, Nela & Kvaček, Zlatko', 1],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 4],
    ['Copeland, Edwin Bingham', 1],
    ['Cremers, Georges & Aupic, Cécile', 4],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 2],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 5],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Kvaček, Zlatko & Martinetto, Edoardo', 1],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 2],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 4],
    ['Wan, Xia & Zhang, Li-Bing', 3],
    ['Wijnands, Dirk Onno & Heniger, Johannes & Veldkamp, Jan Frederik', 2],
    ['Other (4)', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=39)',
    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);