function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alderwerelt van Rosenburgh, Capt. C. R. W. K.', 4],
    ['Boyce, Peter Charles', 11],
    ['Boyce, Peter Charles & Bogner, Josef', 1],
    ['Di, Mi & Qin, Yan-Yan & Shen, Zi-Hao & Zhang, Tao', 7],
    ['Engler, Heinrich Gustav Adolf', 6],
    ['Engler, Heinrich Gustav Adolf & Krause, Johann Wilhelm', 13],
    ['Li, Shan & Bian, Xun', 9],
    ['Liu, Jing & Li, Zhimin & Bian, Xun', 1],
    ['Lu, Xiangyi & Liu, Jing & Huang, Xiaojuan & Bian, Xun', 11],
    ['Qin, Yanyan & Jiang, Huiting & Liu, Xianwei & Li, Kai', 13],
    ['Ridley, Henry Nicholas', 1],
    ['Shi, Fuming', 13],
    ['Tan, Ming Kai & Abdul Wahab, Rodzay bin Haji', 1],
    ['Wong, Sin Yeng & Joling, Jyloerica', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=98)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);