function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Frank, Christa', 3],
    ['Harzhauser, Mathias & Neubauer, Thomas A.', 1],
    ['Jochum, Adrienne & Bochud, Estee & Haberthuer, David', 2],
    ['Jochum, Adrienne & Ruthensteiner, Bernhard & Kampschulte, Marian', 1],
    ['Jochum, Adrienne & Weigand, Alexander M. & Bochud, Estee', 3],
    ['Müller, Otto Friedrich', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);