function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Xiaoxiao & Song, Yuehua', 3],
    ['Lin, Shuanghu & Zou, Hongfen & Huang, Min & Zhang, Yalin', 7],
    ['Luo, Guimei & Song, Qingfa & Song, Yuehua', 2],
    ['Luo, Guimei & Wang, Jinqiu & Song, Yuehua', 4],
    ['Song, Yuehua & Li, Zizhong & Xiong, Kangning', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);