function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Han, Guang-Xin & Zhang, Feng & Zhang, Zhi-Sheng', 1],
    ['Liu, Jie & Li, Shuqiang', 8],
    ['Liu, Jie & Li, Shuqiang & Pham, Dinh-Sac', 3],
    ['Wang, Xin-Ping & Xu, Xiang & Li, Shuqiang', 6],
    ['Zhang, Xiaoqing & Zhao, Zhe & Zheng, Guo & Li, Shuqiang', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    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);