function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Della Rocca, Francesca & Stefanelli, Silvia & Cardarelli, Elisa', 1],
    ['Fontana, Paolo & Buzzetti, Filippo Maria & Massa, Bruno', 2],
    ['Ghahari, H. & Havaskary, M. & Tabari, M. & Ostovan, H.', 5],
    ['Giuliano, Davide', 2],
    ['Hollier, John', 6],
    ['MACHÁýKOVÁ, Lenka & FIKÁýEK, Martin', 1],
    ['Monnerat C. & Thorens P. & Walter T. & Gonseth Y.', 3],
    ['Prischepchik, O. V. & Storozhenko, S. Yu.', 1],
    ['Skejo, Josip & Rebrina, Fran & Szövényi, Gergely', 4],
    ['Taylan, Mehmet Sait & Şirin, Deniz & Sevgili, Hasan', 4],
    ['Temreshev, Izbasar I. & Makezhanov, Arman M.', 2],
    ['Terskov, E. N.', 1],
    ['Tlili, Haithem & Abdellaoui, Khemais', 2],
    ['Usmani, Mohammad Kamil', 5],
    ['Usmani, Mohd. Kamil & Nayeem, Md. Rashid', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);