function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Liu, Ji-he & Xiao, Yong-hong & Zhang, Meng-zhen & Xu, Xiang', 1],
    ['Liu, Ke-ke & Luo, Hui-pu & Xu, Xiang & Chen, Zhiwu', 3],
    ['WANG, XIN-PING', 1],
    ['Xu, Xiang & Li, Shuqiang', 1],
    ['Zhang, Meng & Irfan, Muhammad & Wang, Lu-Yu & Zhang, Zhi-Sheng', 8]
  ]);
  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);