function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abbott, John C. & Hibbitts, Troy D.', 2],
    ['Bazzi, Gaia & Galimberti, Andrea & Foglini, Claudio', 2],
    ['Hagen, H.', 3],
    ['Jocque, Merlijn & Garrison, Rosser', 1],
    ['K. J. Morton', 1],
    ['Martin, R.', 1],
    ['Novelo-Gutiérrez, Rodolfo', 3],
    ['Pompilio, Lucia & Mosini, Andrea', 1],
    ['Schneider, Thomas & Ikemeyer, Dietmar & Müller, Ole', 1],
    ['Selys-Longchamps, Edm. de', 1],
    ['Thoma, Marco & Althaus, Sarah', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);