function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Kaya, Sarp & Chobanov, Dragan & Çiplak, Battal', 7],
    ['Kaya, Sarp & Korkmaz, E. Mahir & Çiplak, Battal', 2],
    ['Sirin, Deniz & Taylan, Mehmet Sait & Mol, Abbas', 3],
    ['Skejo, Josip & Rebrina, Fran & Szövényi, Gergely', 1],
    ['Taylan, Mehmet Sait & Mol, Abbas & Sevgili, Hasan & Şirin, Deniz', 2],
    ['Taylan, Mehmet Sait & Mol, Abbas & Şirin, Deniz', 1],
    ['Taylan, Mehmet Sait & Şirin, Deniz & Sevgili, Hasan', 1],
    ['Ünal, Mustafa', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);