function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bagheri, Mohammad & Irani-Nejad, Karim Haddad & Kamali, Karim', 4],
    ['Khanjani, M. & Mohammadi, E. & Izadi, H. & Khanjani, M.', 2],
    ['Khanjani, Mohammad & Fayaz, Bahman Asali & Khanjani, Masoumeh', 3],
    ['KhaustovK, Alexander A. & KhaustovK, Vladimir A.', 2],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 3],
    ['Mahdavi, Sayed Mosayeb & Kazemi, Shahrooz', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);