function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Agnarsson, Ingi', 13],
    ['Agnarsson, Ingi & Jencik, Brian B. & Veve, Giselle M.', 18],
    ['Agnarsson, Ingi & Zhang, Jun-Xia', 9],
    ['Crespo, Luis C & Domenech, Marc & Enguidanos, Alba', 1],
    ['Dean, David Allen', 1],
    ['Heimer, S., Nentwig, W.', 1],
    ['W. Framenau, Volker', 1],
    ['Zhang, Bao-Shi & Liu, Long & Zhang, Feng', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=49)',
    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);