function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alexiou, Sotiris', 1],
    ['Boztepe, Zehra & Kaya, Sarp & Çiplak, Battal', 9],
    ['Chobanov, Dragan P. & Kaya, Sarp & Çiplak, Battal', 5],
    ['Chobanov, Dragan P. & Sevgili, Hasan & Heller, Klaus-Gerhard', 14],
    ['Holuša, Jaroslav & Kočárek, Petr & Vlk, Robert & Marhoul, Pavel', 1],
    ['Ingrisch, Sigfrid & Pavićević, Dragan', 9],
    ['Kaya, Sarp & Chobanov, Dragan & Heller, Klaus-Gerhard', 15],
    ['Kaya, Sarp & Çiplak, Battal & Chobanov, Dragan', 3],
    ['Lehmann, Arne W. & Willemse, Fer & Heller, Klaus – gerhard', 1],
    ['MACHÁýKOVÁ, Lenka & FIKÁýEK, Martin', 2],
    ['Sergeev, M. G. & Storozhenko, S. Yu. & Benediktov, A. A.', 1],
    ['Sevgili, Hasan & Şirin, Deniz & Heller, Klaus-Gerhard', 9],
    ['Skejo, Josip & Rebrina, Fran & Szövényi, Gergely', 11],
    ['Wu, Chao & Liu, Chunxiang', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=83)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);