function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['H. E. Hess & E. Landolt & R. Hirzel', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 3],
    ['Hunt, George Edward', 3],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Kubentayev, Serik A. & Efimov, Petr G. & Alibekov, Daniyar T.', 1],
    ['Meng, Yu-Fang & Hu, Ai-Qun & Yi, Qi-Fei & Xing, Fu-Wu', 1],
    ['Ormerod, Paul & Kurzweil, Hubert & Watthana, Santi', 2],
    ['Radins, José A. & Salazar, Gerardo A. & Cabrera, Lidia I.', 1],
    ['Shi, Xiao-Ling & Kang, Yang & Liu, Yu-Ying & Tu, Song', 1],
    ['Vega, Hermes & Cetzal-Ix, William & Mó, Edgar', 17],
    ['Wood, Jeffrey James', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=36)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);