function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ewing, Henry Ellsworth', 1],
    ['Frivaldsky, J.', 1],
    ['Hagen, Hermann August Dr.', 1],
    ['Joseph, Gustav', 1],
    ['Lapschoff, I. I.', 2],
    ['Novák, János & Dányi, László', 1],
    ['Schiødte, J. C.', 1],
    ['Simon, Eugène', 3],
    ['Tömösváry, Ö.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);