function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cuadrado, Daniel & Rodríguez, Jorge & Moro, Leopoldo', 2],
    ['Doignon, Gilles & Artois, Tom J. & Deheyn, Dimitri', 1],
    ['Faubel, A. & Warwick, R. M.', 1],
    ['Faubel, Anno', 2],
    ['Gammoudi, Mehrez & Egger, Bernhard & Tekaya, Saïda', 2],
    ['Gammoudi, Mehrez & Garbouj, Myriam & Egger, Bernhard', 3],
    ['Gammoudi, Mehrez & Tekaya, Saïda & Noreña, Carolina', 3],
    ['Hagiya, Morio', 1],
    ['Holleman, John J.', 2],
    ['Marquina, Daniel & Osca, David & Rodríguez, Jorge', 1],
    ['Ramos-Sánchez, Mariela & Bahia, Juliana', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);