function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alderwerelt van Rosenburgh, Capt. C. R. W. K.', 5],
    ['Arana, Marcelo D.', 1],
    ['Becherer', 6],
    ['Blume, Carl Ludwig von', 1],
    ['Callmander, Martin W. & Mazumdar, Jaideep & Jarvis, Charles E.', 2],
    ['Copeland, Edwin Bingham', 2],
    ['Cremers, Georges & Boudrie, Michel', 2],
    ['Herter, Wilhelm Gustav Franz (Guillermo Gustavo Francisco)', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 9],
    ['Info Flora', 4],
    ['Jarvis, Charlie', 6],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 2],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Hohla, M. & Schröck, C.', 4],
    ['Øllgaard, Benjamin & Testo, Weston', 5],
    ['Other (6)', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=60)',
    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);