function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Forel, A.', 6],
    ['Kiran, Kadri & Karaman, Celal', 1],
    ['Laciny, Alice & Zettel, Herbert & Kopchinskiy, Alexey', 2],
    ['Lapeva-Gjonova, Albena & Antonova, Vera', 1],
    ['Mayr, G.', 5],
    ['Roger, J.', 3],
    ['Santschi, F.', 1],
    ['Schifani, Enrico & Giannetti, Daniele & Csősz, Sándor', 1],
    ['Ward, Philip S. & Blaimer, Bonnie B. & Fisher, Brian L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);