function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bresseel, Joachim & Constant, Jérôme', 3],
    ['Delfosse, Emmanuel & Cliquennois, Nicolas & Depraetere, Marion', 1],
    ['Hennemann, Frank H. & Conle, Oskar V.', 5],
    ['Hennemann, Frank H. & Conle, Oskar V. & Zhang, Weiwei', 3],
    ['Qian, Yu-Han & Xie, Chong-Xin & Wen, Jun & Wang, Yu', 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);