function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Della Rocca, Francesca & Stefanelli, Silvia & Cardarelli, Elisa', 1],
    ['Hollier, John', 1],
    ['Kim, Tae-Woo & Puskás, Gellért', 1],
    ['MACHÁýKOVÁ, Lenka & FIKÁýEK, Martin', 2],
    ['Monnerat C. & Thorens P. & Walter T. & Gonseth Y.', 2],
    ['Skejo, Josip & Rebrina, Fran & Szövényi, Gergely', 2],
    ['Terskov, E. N.', 1],
    ['Tishechkin, Dmitri Yu.', 1],
    ['Şirin, Deniz & Mol, Abbas & Taylan, Mehmet Saýt & Demýr, Eyüp', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);