function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hassan, S. H. & Khidr, A. E. - A. A. & Samak, O. A. A.', 1],
    ['Looss, A.', 1],
    ['Machida, Masaaki', 1],
    ['Martin, W. E.', 1],
    ['Nisreen Ezz El-Dien, M. & Abdel-Rahman, M. S.', 1],
    ['Ramadan, M. M. & Saoud, M. F. A & Ashour, A. A. & Mansour, D. A.', 1],
    ['Rekharani, Z. & Madhavi, R.', 1],
    ['Sharma, P. N. & Gupta, A. N.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    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);