function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aung, Aye Thida & Huang, Jian & Do, Truong Van & Song, Ai', 3],
    ['Becherer', 28],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 2],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 1],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 1],
    ['Desjardins, Émilie & Lai, Sandra & Payette, Serge & Dubé, Martin', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 10],
    ['Info Flora', 11],
    ['Jarvis, Charlie', 7],
    ['Jeanmonod, Daniel & éd.', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 10],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 1],
    ['Smith, MacKenzie A. & Greenwalt, Dale E. & Manchester, Steven R.', 1],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Hohla, M. & Schröck, C.', 2],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Wittmann, H. & Hohla, M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=80)',
    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);