function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Wan-Hao & Han, Yan-Feng & Liang, Jian-Dong & Tian, Wei-Yi', 3],
    ['Chen, Wan-Hao & Liang, Jian-Dong & Ren, Xiu-Xiu & Zhao, Jie-Hong', 3],
    ['Wang, Ting & Li, Jun & Chang, Xiaoyun & Li, Zengzhi', 3],
    ['Wang, Yao & Wang, Zhi-Qin & Thanarut, Chinnapan & Dao, Van-Minh', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 4, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);