function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Airy Shaw, Herbert Kenneth', 20],
    ['Engler, Heinrich Gustav Adolf', 1],
    ['Gage, Andrew Thomas', 1],
    ['Gilli, Alexander', 2],
    ['Heike Feldhaar & Ulrich Maschwitz & Brigitte Fiala', 2],
    ['Jarvis, Charlie', 2],
    ['Perry, Lily May', 17],
    ['Schumann, Karl Moritz', 1],
    ['Smith, Johannes Jacobus', 2],
    ['Takeuchi, Wayne', 1],
    ['Takeuchi, Wayne N.', 1],
    ['Volkens, Georg Ludwig', 1],
    ['Warburg, Otto', 1],
    ['Whitmore, Timothy Charles', 20],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=74)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);