function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Giuliano, Davide', 1],
    ['Holuša, Jaroslav & Kočárek, Petr & Vlk, Robert & Marhoul, Pavel', 2],
    ['Ingrisch, Sigfrid & Pavićević, Dragan', 1],
    ['Kleukers, Roy M. J. C. & Odé, Baudewijn & Fontana, Paolo', 3],
    ['Monnerat C. & Thorens P. & Walter T. & Gonseth Y.', 4],
    ['Skejo, Josip & Rebrina, Fran & Szövényi, Gergely', 6],
    ['Willemse, Luc & Odé, Baudewijn & Tilmans, Jos', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);