function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['D’Archino, Roberta & Zuccarello, Giuseppe C.', 2],
    ['Khosravi, Erfan & Sari, Alireza & Mirziee-Ataabadi, Majid', 2],
    ['Manghisi, Antonio & Gall, Line Le & Bonillo, Céline', 1],
    ['Nguyen, Xuan-Vy & Nguyen-Nhat, Nhu-Thuy & Nguyen, Xuan-Thuy', 1],
    ['de Clerck, Olivier & Coppejans, Eric & Schils, Tom', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=7)',
    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);