function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Garraffoni, André R. S. & Melchior, Marina P.', 4],
    ['Grilli, Paolo & Kristensen, Reinhardt Møbjerg & Balsamo, Maria', 1],
    ['Kolicka, Małgorzata', 3],
    ['Kolicka, Małgorzata & Jankowska, Emilia & Kotwicki, Lech', 2],
    ['Kolicka, Małgorzata & Kisielewski, Jacek & Kotwicki, Lech', 2],
    ['Kolicka, Małgorzata & Kisielewski, Jacek & Nesteruk, Teresa', 2],
    ['Kånneby, Tobias', 5],
    ['Schwank, Peter & Kånneby, Tobias', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);