function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bukejs, Andris', 1],
    ['Eschscholtz, Friedrich', 1],
    ['Fanti, Fabrizio & Damgaard, Anders Leth', 1],
    ['Fanti, Fabrizio & Ghahari, Hassan', 21],
    ['Fanti, Fabrizio & Pankowski, Mary K.', 1],
    ['Kazantsev, Sergey V.', 2],
    ['Kazantzev, Sergey V. & Takahashi, Kazuhiro', 8],
    ['Medvedev, Lev & Ryvkin, Alexandr B.', 3],
    ['Webster, Reginald P. & Webster, Vincent L.', 3],
    ['Yang, Yu-Xia & Yang, Xing-Ke', 2],
    ['Yildirim, E. & Kopetz, A. & Bulak, Y.', 6],
    ['Švihla, Vladimír', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=50)',
    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);