function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bousquet, Yves', 1],
    ['Brzoska, David & Knisley, C. Barry & Slotten, Jeffrey', 1],
    ['Duran, Daniel P. & Roman, Stephen J.', 2],
    ['Duran, Daniel P. & Shetterly, John A. & Vogtsberger, Roy C.', 1],
    ['Jumean, Z. & Oldham, M. J. & Fleming, K. J. & Duran, D. P.', 1],
    ['Keller, Oliver & Schnepp, Kyle E. & Ashman, Krystal L.', 5],
    ['Wiesner, Jürgen & Bandinelli, Aligi', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);