function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Azizi, Kourosh & Eskandari, Ali & Karegar, Akbar & Ghaderi, Reza', 1],
    ['Bharti, Lovely & Bhat, Aashaq Hussain & Chaubey, Ashok Kumar', 1],
    ['Holovachov, Oleksandr', 26],
    ['P. A. A. LOOF', 4],
    ['Shahina, F. & Nasira, K. & Firoza, K. & Erum, Y. I.', 11],
    ['Soós, A.', 1],
    ['Stefanski, W.', 1],
    ['Von W. Schneider', 1],
    ['Wilhelm Schneider', 1],
    ['Xu, Chun-Ling & Xie, Hui & Li, Yu', 1],
    ['Zhuo, Kan & Wang, Honghong & Liao, Jinling', 1],
    ['Zullini, A.', 2],
    ['Árpád, Soós', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=55)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);