function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Baldenstein, Thomas Conrad von', 1],
    ['Barcelos, Luis MD & Rodrigues, Pedro R & Bried, Joel', 6],
    ['Boano, Giovanni & Belemsobgo, Urbain & Silvano, Fabrizio', 6],
    ['Dean, W. Richard J. & Åhlander, Erik & Johansson, Ulf S.', 1],
    ['Frahnert, Sylke & Turner, Donald A. & Bracker, Cordula', 3],
    ['Naumann, Johann Andreas & Naumann, Johann Friedrich', 1],
    ['Nguyen, Jacqueline M. T. & Hand, Suzanne J. & Archer, Michael', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);