function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Boumendjel, Lylia & Rabet, Nicolas & Amarouayache, Mounia', 1],
    ['Chergui, Isslam & Satour, Abdellatif & Bouzid, Abdelhakim', 4],
    ['Cottarelli, Vezio & Aygen, Cem & Mura, Graziella', 3],
    ['Cottarelli, Vezio & Mura, Graziella & Ippolito, Giuseppe', 1],
    ['Rogers, D. Christopher', 3],
    ['Rogers, D. Christopher & Soufi, Mahmoud', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);