function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Hui-Ming & Zheng, Chang-Bin & Jiang, Xuan-Kong', 1],
    ['De Zoysa, H. K. S. & Nguyen, Anh D. & Wickramasinghe, S.', 3],
    ['Enghoff, Henrik', 3],
    ['Golovatch, Sergei I.', 9],
    ['Golovatch, Sergei I. & Wesener, Thomas', 2],
    ['Hollier, John & Stöckli, Eduard & Wesener, Thomas', 4],
    ['John Hollier & Edmund Schiller & Nesrine Akkari', 1],
    ['Likhitrakarn, Natdanai & Golovatch, Sergei I. & Panha, Somsak', 2],
    ['Likhitrakarn, Natdanai & Jirapatrasilp, Parin', 4],
    ['Liu, Weixin & Huo, Qingbo', 1],
    ['Novis, Phil M. & Visnovsky, Gabriel', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);