function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bezděčková, Klára & Bezděčka, Pavel & Macek, Ján', 1],
    ['Christoph Germann', 1],
    ['Collingwood, C. A.', 2],
    ['Else, George R. & Bolton, Barry & Broad, Gavin R.', 4],
    ['Forel, A.', 1],
    ['Gratiashvili, N. & Barjadze, S.', 2],
    ['Lapeva-Gjonova, Albena & Antonova, Vera', 8],
    ['Lapeva-Gjonova, Albena & Radchenko, Alexander G.', 7],
    ['Paknia, O. & Radchenko, A. & Pfeiffer, M.', 1],
    ['Sanetra, M. & Guesten, R.', 3],
    ['Sanetra, Matthias & Güsten, Robert', 1],
    ['Smith, F.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=33)',
    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);