function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahl, E.', 7],
    ['Berkenkamp, H. O.', 1],
    ['Berkenkamp, H. O. & Etzel, V.', 2],
    ['Blache, J. & Miton, F.', 1],
    ['Daget, J.', 2],
    ['David, L. & Poll, M.', 2],
    ['Gras, R.', 1],
    ['Klausewitz, Wolfgang', 1],
    ['Meinken, H.', 3],
    ['Pellegrin, J.', 1],
    ['Poll, M.', 1],
    ['Radda, A. C.', 1],
    ['Résumé, Jacques Daget', 1],
    ['Wildekamp, R. H.', 2],
    ['Worthington, E. B.', 2],
    ['Other (3)', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);