function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Beyarslan, Ahmet & Fischer, Maximilian', 2],
    ['Dolati, Sana & Talebi, Ali Asghar', 1],
    ['Fischer, M. & Madl, M.', 9],
    ['Gadallah, Neveen S. & Edmardash, Yusuf A. & Mansour, Amany N.', 1],
    ['Gadallah, Neveen S. & Ghahari, Hassan', 1],
    ['Khajeh, Nahid & Rakhshani, Ehshan', 1],
    ['Madl, M. & Achterberg, C. Van', 2],
    ['Madl, Michael', 1],
    ['Wharton, Robert', 2],
    ['Wu, Qiong & Achterberg, Cornelis van & Tan, Jiang-Li', 11]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);