function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Pan, Hongbo & Gao, Feng & Li, Jiqiu & Lin, Xiaofeng', 1],
    ['Pan, Hongbo & Gao, Feng & Lin, Xiaofeng & Warren, Alan', 3],
    ['Vďačný, Peter & Rajter, Ľubomír', 3],
    ['Wu, Lei & Chen, Ruimin & Yi, Zhenzhen & Li, Jiqiu & Warren, Alan', 5],
    ['Zhang, Gongaote & Zhao, Yan & Chi, Yong & Warren, Alan', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);