function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alessandri, G. De', 2],
    ['Annandale, N.', 1],
    ['Darwin, Charles Robert', 1],
    ['Ellis, John & Solander, Daniel Carl', 2],
    ['Gruvel, J. a.', 1],
    ['Harzhauser, Mathias & Schlögl, Jan', 1],
    ['Linnaeus, Carolus', 6],
    ['Molina, G. I.', 1],
    ['Müller, O. F.', 1],
    ['Nilsson-Cantell, C. a.', 2],
    ['Pilsbry, Henry A.', 1],
    ['Schiffer, Philipp H. & Herbig, Hans-Georg', 3],
    ['Spengler, Lorenz', 2],
    ['Trivedi, Jigneshkumar N. & Doshi, Mahima & Patel, Krupal J.', 2],
    ['Withers, T. H.', 3],
    ['Other (4)', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=33)',
    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);