function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bergh, Eugene W. & Compton, John S.', 1],
    ['Hielkema, Auke J. & Hielkema, Meindert A.', 1],
    ['Ismail, Ahmed A.', 2],
    ['Mamo, Briony L.', 2],
    ['Schönfeld, Joachim & Lübbers, Julia', 1],
    ['Smith, Andrew B. T.', 1],
    ['Wisshak, Max', 4],
    ['Zaragoza-Caballero, Santiago & Rodríguez-Mirón, Geovanni M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);