function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['C. O & Madl, M. & Olmi, M.', 3],
    ['Lucena, Daercio A. A. & Santos-Neto, Pedro E.', 2],
    ['Madl, M. & Rosa, P.', 6],
    ['Nguyen, Lien Thi Phuong & Wiśniowski, Bogdan', 6],
    ['Rosa, Paolo & Aswathi, Pokkattu Gopi & Bijoy, Chenthamarakshan', 1],
    ['Rosa, Paolo & Gadallah, Neveen S. & Brothers, Denis J.', 1],
    ['Rosa, Paolo & Heim, René & Bernasconi, Marco Valerio', 1],
    ['Rosa, Paolo & Wei, Na-Sen & Notton, David & Xu, Zai-Fu', 5],
    ['Rosa, Paolo & Wei, Na-sen & Xu, Zai-fu', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=26)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);