function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fischer, Eberhard', 6],
    ['Fischer, Eberhard & Andriantiana, Jacky Lucien & Sieder, Anton', 1],
    ['Fischer, Eberhard & Vollesen, Kaj B. & Darbyshire, Iain', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 2],
    ['Info Flora', 2],
    ['Jarvis, Charlie', 8],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Melzer, H. & Barta, Th.', 1],
    ['Merrill, Elmer Drew & Perry, Lily May', 1],
    ['Nacoulma, Blandine M. I. & Schmidt, Marco & Hahn, Karen', 1],
    ['Pennell, Francis Whittier', 1],
    ['Prasad, Mangavayal Govindan & Sunojkumar, Purayidathkandy', 1],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Thulin, Mats', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    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);