function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blackburn, Thomas', 2],
    ['Charpentier, T. de', 1],
    ['Charpentier, Toussaint de', 4],
    ['Cowley, J.', 3],
    ['Fabricius, J. C.', 4],
    ['Fabricius, Johann Christian', 1],
    ['Hagen, H.', 8],
    ['Hagen, Hermann August Dr.', 2],
    ['Hansemann, J. W. A.', 3],
    ['K. J. Morton', 4],
    ['Martin, R.', 6],
    ['McLachlan, Robert', 3],
    ['Vander Linden, P. L.', 1],
    ['Vander Linden, Pierre Léonard', 1],
    ['de Sélys-Longchamps, Edmond & Hagen, Hermann August Dr.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=44)',
    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);