function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Castillon, Jean-Philippe', 12],
    ['Grace, Olwen M. & Klopper, Ronell R. & Smith, Gideon F.', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 5],
    ['Info Flora', 3],
    ['Klopper, Ronell R. & Crouch, Neil R. & Smith, Gideon F.', 48],
    ['Klopper, Ronell R. & Grace, Olwen M. & Klopper, Arrie W.', 20],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 3],
    ['Smith, Gideon F.', 5],
    ['Smith, Gideon F. & Figueiredo, Estrela', 3],
    ['Smith, Gideon F. & Figueiredo, Estrela & Klopper, Ronell R.', 8],
    ['Smith, Gideon F. & Figueiredo, Estrela & Verloove, Filip', 6],
    ['Smith, Gideon F. & Klopper, Ronell R.', 5],
    ['Smith, Gideon F. & Klopper, Ronell R. & Crouch, Neil R.', 3],
    ['Thiede, Joachim & Campbell-Barker, Theo Peter', 3],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 3],
    ['Other (18)', 23]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=153)',
    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);