function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Li, Shuwan & Han, Mengqi & Li, Xiaojie & Li, Zhenyu', 1],
    ['Nguyen, Cuong Huu & Nguyen, Ly Van & Nguyen, Khang Sinh', 1],
    ['Peng, Tao & He, Shun-Zhi & Wang, Shun-Li & Huang, Dan', 1],
    ['Weber, Anton & Wei, Yi-Gang & Sontag, Susanne & Möller, Michael', 3],
    ['Wen, Fang & Tang, Wen-Xiu & Wei, Yi-Gang', 1],
    ['Wu, Zhaowen & Guo, Zhiyou & Deng, Chaoyi & Li, Zhenyu', 1],
    ['Zhang, Li-Xia & Tan, Yun-Hong & Li, Jian-Wu & Wen, Bin', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    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);