function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 2],
    ['Evenhuis, Neal L. & O’Hara, James E. & Pape, Thomas', 1],
    ['Lücking, Robert & Dal-Forno, Manuela & Lawrey, James D.', 1],
    ['Noyes, John Stuart', 1],
    ['SETLIFF, GREGORY P.', 1],
    ['Wijayawardene, Nalin N. & Dai, Dong-Qin & Premarathne, Bhagya M.', 3],
    ['Williams, D. J. & Z. - Q', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=10)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);