function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Azizi, Kourosh & Eskandari, Ali & Karegar, Akbar & Ghaderi, Reza', 2],
    ['Ghaderi, Reza & Karegar, Akbar', 4],
    ['Ghaderi, Reza & Karegar, Akbar & Niknam, Gholamreza', 1],
    ['Handoo, Zafar A. & Palomares-Rius, Juan E.', 1],
    ['Rybarczyk-Mydłowska, Katarzyna & Sikora, Grzegorz', 2],
    ['Xu, Chun - Ling & Xie, Hui & Zhao, Chuan - Bo', 1],
    ['Zeng, Yongsan & Ye, Weimin & Tredway, Lane & Martin, Samuel', 1],
    ['Zhang, Chenying & Munawar, Maria & Castillo, Pablo', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);