function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bal, Durmuş Ali', 1],
    ['Bolger, Thomas & Arroyo, Julio & Piotrowska, Katarzyna', 2],
    ['Farahi, Sara & Shishehbor, Parviz & Nemati, Alireza', 1],
    ['Halliday, R. B.', 1],
    ['Kontschan, J.', 1],
    ['Kontschán, J.', 4],
    ['Kontschán, J. & Starý, J.', 1],
    ['Kontschán, Jenó', 2],
    ['Kontschán, Jenõ', 2],
    ['Kontschán, JenŐ', 3],
    ['Kontschán, Jenő & Starý, Josef', 4],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 5],
    ['Lin, Jian-Zhen', 2],
    ['Nemati, Alireza & Riahi, Elham & Khalili-Moghadam, Arsalan', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    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);