function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bukejs, Andris & Háva, Jiří', 2],
    ['Herrmann, Andreas & Háva, Jiří', 1],
    ['Herrmann, Andreas & Háva, Jiří & Kadej, Marcin', 2],
    ['Holloway, Graham J. & Luna, Ivan Cañada', 2],
    ['Háva, J. & Damgaard, A. L.', 2],
    ['Háva, Jiří', 3],
    ['Háva, Jiří & Kadej, Marcin', 2],
    ['Kadej, Marcin & Jaroszewicz, Sylwia', 1],
    ['Nakládal, Oto & Háva, Jiří', 1],
    ['Nardi, Gianluca & Hava, Jiri', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    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);