function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bian, Dongju & Guo, Cheng & Ji, Lanzhu', 2],
    ['Freitag, Hendrik', 5],
    ['Freitag, Hendrik & Balke, Michael', 7],
    ['Freitag, Hendrik & Jäch, Manfred A.', 7],
    ['Freitag, Hendrik & Kodada, Ján', 20],
    ['Grouvelle, Antoine', 1],
    ['Jäch, Manfred A.', 9],
    ['Kodada, Jan & Jaech, Manfred A. & Freitag, Hendrik', 5],
    ['Kodada, Ján & Jäch, Manfred A. & Jr, Fedor Čiampor', 2],
    ['Kodada, Ján & Jӓch, Manfred A. & Čiampor, Fedor', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=59)',
    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);