function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Jin, Chi & Zhang, Feng', 11],
    ['Lin, Yejie & Li, Shuqiang & Pham, Dinh-Sac', 2],
    ['Liu, Ke-Ke & Jiang, Zi-Min & Ma, Ning & Li, Wen-Hui', 3],
    ['Lu, Ying & Chu, Chang & Lin, Zixuan & Pham, Dinh-Sac', 2],
    ['Wang, Lu-Yu & Irfan, Muhammad & Lu, Qian-Le & Zhang, Feng', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=25)',
    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);