function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bezděčková, Klára & Bezděčka, Pavel & Macek, Ján', 1],
    ['Cedric A. Collingwood & Donat Agosti & Mostafa R. Sharaf', 1],
    ['Dubovikoff, Dmitry A. & Longino, John T.', 1],
    ['Dubovikov, D. A. & Longino, J. T.', 2],
    ['Forel, A.', 2],
    ['Gratiashvili, N. & Barjadze, S.', 3],
    ['Lapeva-Gjonova, Albena & Antonova, Vera', 6],
    ['Martynov, Alexander V. & Radchenko, Alexander G.', 1],
    ['Matthew Prebus & David Lubertazzi', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);