function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Zhi-Teng & Hou, Jia-Lin', 1],
    ['Huo, Qing-bo & Zhu, Bin-Qing & Du, Yu-Zhou', 3],
    ['Li, Weihai & Mo, Raorao & Murányi, Dávid', 5],
    ['Mo, Raorao & Wang, Guoquan & Li, Weihai', 1],
    ['Stark, Bill P. & Sivec, Ignac', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=14)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);