function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 4],
    ['Gibbs, Lilian Suzette', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 5],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 4],
    ['Info Flora', 10],
    ['Jarvis, Charlie', 7],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 8],
    ['Koorders, Sijfert Hendrik', 4],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 4],
    ['Linnaeus, Carolus', 12],
    ['Ridley, Henry Nicholas', 7],
    ['Sleumer, Hermann Otto', 62],
    ['Smith, Johannes Jacobus', 12],
    ['Tamayo, Maverick N. & Fritsch, Peter W.', 2],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 12],
    ['Other (16)', 18]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=174)',
    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);