function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Advay, Mahfouz & Rix, Martyn & Tekşen, Mehtap', 1],
    ['Bartolucci, Fabrizio & Peruzzi, Lorenzo', 3],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 1],
    ['Chen, Ronglian & Zhang, Faqi & Chen, Shilong & Chi, Xiaofeng', 12],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 3],
    ['Info Flora', 3],
    ['Jarvis, Charlie', 5],
    ['Karunarathne, Krishan D. & Croos, M. D. S. T. De', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Le Brun, P.', 1],
    ['Linnaeus, Carolus', 5],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 9],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Hohla, M. & Schröck, C.', 1],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Wittmann, H. & Hohla, M.', 2],
    ['Other (1)', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=51)',
    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);