function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fischer, J. G.', 1],
    ['Kaup, Johann Jakob', 1],
    ['Peters, Wilhelm Carl Hartwig', 1],
    ['Petit, G.', 1],
    ['Popta, C. M. L.', 1],
    ['Putnam, F. W.', 1],
    ['Rendahl, H.', 1],
    ['Steindachner, F. & Döderlein, L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);