function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alexander, Timothy & Seehausen, Ole', 1],
    ['Artaev, Oleg & Ruchin, Alexander B.', 1],
    ['Basilewsky, S.', 1],
    ['De Filippi, F.', 1],
    ['Eagderi, Soheil & Mouludi-Saleh, Atta & Esmaeili, Hamid Reza', 1],
    ['Günther, Albert Charles Lewis Gotthilf', 1],
    ['Heckel, J. J.', 4],
    ['Linstow, O. F. B. von', 1],
    ['Nurettin Meriç & Lütfiye Eryilmaz & Müfit Özulug', 1],
    ['Richardson, John', 1],
    ['Sayyadzadeh, Golnaz & Esmaeili, Hamid Reza', 1],
    ['Çiçek, Erdoğan & Fricke, Ronald & Eagderi, Soheil', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);