function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahaniazad, M. & Bagheri, M. & Gharakhany, G. & Zarei, E.', 2],
    ['Akyol, Mustafa', 1],
    ['Akyol, Mustafa & Kami & Koç, L', 5],
    ['Barbar, Ziad', 3],
    ['Doġan, Salih', 12],
    ['Ebrahimi, Najmeh & Noei, Javad', 3],
    ['Ghorbani, H. & Bagheri, M. & Ueckermann, E. A.', 2],
    ['Hatami, Parisa & Jafari, Shahriar & Ahmad-Hosseini, Mohammad', 6],
    ['Khan, Eid Muhammad & Kamran, Muhammad & Mirza, Jawwad Hassan', 6],
    ['Khosravinejad, Maryam & Jafari, Shahriar & Paktinat-Saeij, Saeid', 1],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 1],
    ['Mohammad-Doustaresharaf, Mojtaba & Bagheri, Mohammad', 7],
    ['Paktinat-Saeij, Saeid & Damavandian, Mohammad Reza', 2],
    ['Willmann, C.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=53)',
    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);