function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Zhaoyang & Li, Dengqing & Li, Daiqin & Xu, Xin', 4],
    ['Chen, Zhaoyang & Liu, Fengxiang & Li, Daiqin & Xu, Xin', 5],
    ['Li, Dengqing & Liu, Fengxiang & Li, Daiqin & Xu, Xin', 4],
    ['Li, Dengqing & Liu, Hao & Xu, Xin', 3],
    ['Ono, Hirotsugu', 2],
    ['Xu, Xin & Liu, Fengxiang & Chen, Jian & Ono, Hirotsugu', 1],
    ['Zhang, Yan & Chen, Zhaoyang & Li, Daiqin & Xu, Xin', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);