function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bachvarova, Darina & Vagalinski, Boyan & Doichinov, Aleksandar', 1],
    ['Calvanese, Victor C. & Brescovit, Antonio D. & Bonato, Lucio', 1],
    ['Chipman, Ariel D. & Dor, Neta & Bonato, Lucio', 1],
    ['Iorio, Étienne & Zapparoli, Marzio & Ponel, Philippe', 1],
    ['Simaiakis, Stylianos Michail & Akkari, Nesrine', 1],
    ['Simaiakis, Stylianos Michail & Zapparoli, Marzio', 2],
    ['Zapparoli, Marzio', 1],
    ['Zapparoli, Marzio & Iorio, Etienne', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=10)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);