function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Constant, Jérôme & Pham, Hong-Thai', 8],
    ['Gnezdilov, Vladimir M.', 1],
    ['Gnezdilov, Vladimir M. & Thierry, Bourgoin', 1],
    ['Meng, Rui & Wang, Yinglun', 6],
    ['Meng, Rui & Webb, Michael Donald & Wang, Ying-Lun', 3],
    ['Stål, Carolus', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);