function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Di, Zhi-Yong & Cao, Zhi-Jian & Wu, Ying-Liang & Li, Wen-Xin', 2],
    ['Di, Zhi-Yong & Wu, Ying-Liang & Cao, Zhi-Jian & Xiao, Heng', 12],
    ['Di, Zhiyong & He, Yawen & Wu, Yingliang & Cao, Zhijian', 7],
    ['Di, Zhiyong & Qiao, Sha', 1],
    ['Di, Zhiyong & Xu, Xiaobo & Cao, Zhijian & Wu, Yingliang', 4],
    ['K, František', 3],
    ['Kovařík, František', 2],
    ['Kovařík, František & Plíšková, Jana & Šťáhlavský, František', 2],
    ['Sun, Dong & Zhu, Ming-Sheng', 2],
    ['Zhu, Ming-Sheng & Zhang, Lu & Lourenço, Wilson R.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=37)',
    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);