function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Diels, Friedrich Ludwig Emil', 1],
    ['Gibbs, Lilian Suzette', 3],
    ['Ormerod, Paul Abel', 1],
    ['Ridley, Henry Nicholas', 1],
    ['Royen, Pieter van', 7],
    ['Schlechter, Fridrich Richard Rudolf', 6],
    ['Schuiteman, A. & de Vogel, Eduard Ferdinand', 1],
    ['Smith, Johannes Jacobus', 33]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=53)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);