function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gibbs, Lilian Suzette', 1],
    ['Negri, Mauro Pietro & Corselli, Cesare', 1],
    ['Oliver, P. Graham & Holmes, Anna', 1],
    ['Oliver, P. Graham & Holmes, Anna & Killeen, Ian & Light, Janice', 1],
    ['Pilger, Robert Knud Friedrich', 1],
    ['Smith, Edgar A.', 2],
    ['Wiklund, Helena & Taylor, John D. & Dahlgren, Thomas G.', 1],
    ['de Laubenfels, David John', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);