function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abotsi, Komla Elikplim & Kokou, Kouami & Dubuisson, Jean-Yves', 2],
    ['Becherer', 2],
    ['Bouchart-Dufay, Isabelle & Jouy, Alain & Rakotondrainibe, France', 5],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 4],
    ['Fischer, Eberhard & Killmann, Dorothee & Ackermann, Markus', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 4],
    ['Info Flora', 2],
    ['Jarvis, Charlie', 4],
    ['Jeanmonod, Daniel & Schlüssel, André', 1],
    ['Jeanmonod, Daniel & éd.', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Nacoulma, Blandine M. I. & Schmidt, Marco & Hahn, Karen', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);