function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bletz, Molly C. & Scherz, Mark D. & Rakotoarison, Andolalao', 1],
    ['Gabriel, Hugh & Rothe, Laila-Denise & Köhler, Jörn', 3],
    ['Koppetsch, Thore & Pabijan, Maciej & Hutter, Carl R.', 3],
    ['Lehtinen, Richard M. & Glaw, Frank & Vences, Miguel', 2],
    ['Vejarano, Silvia & Thomas, Meike & Vences, Miguel', 6],
    ['Vences, Miguel & Hutter, Carl R. & Glaw, Frank', 1],
    ['Vences, Miguel & Jovanovic, Olga & Safarek, Goran & Glaw, Frank', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    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);