function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bagheri, M. & Navaei-Bonab, R. & Ueckermann, E. A.', 1],
    ['Doġan, Salih', 2],
    ['Dönel, Güldem & Doğan, Salih', 3],
    ['Fan, Qing-Hai & Zhang, Zhi-Qiang', 2],
    ['Hajizadeh, Jalil', 1],
    ['Khanjani, Mohammad & Nasrollahi, Siamak & Zamani, Ali Sina', 3],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 2],
    ['Saboori, Alireza & Shirvani, Zeinab', 1],
    ['Willmann, C.', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    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);