function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Jäger, Peter', 2],
    ['Lan, Tianqi & Jäger, Peter & Zhu, Wenhui & Li, Shuqiang', 3],
    ['Nie, Lei & Yao, Zhiyuan & Pham, Dinh-Sac & Li, Shuqiang', 6],
    ['Tong, Yanfeng & Li, Shuqiang', 2],
    ['Wei, Xiao & Xu, Xiang', 3],
    ['Xu, Hao & Zheng, Guo & Yao, Zhiyuan', 3],
    ['YAO, ZHIYUAN & LI, SHUQIANG', 19],
    ['Yao, Zhiyuan & Li, Shuqiang', 2],
    ['Yao, Zhiyuan & Li, Shuqiang & Jäger, Peter', 2],
    ['Yao, Zhiyuan & Nie, Lei & Li, Shuqiang', 9]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=51)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);