function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cassis, Gerasimos & Symonds, Celia', 21],
    ['Dursun, Ahmet & Fent, Meral', 4],
    ['Golub, Victor B. & Luo, Zhaohui & Vinokurov, Nikolai N.', 1],
    ['Guilbert, Eric', 1],
    ['Guilbert, Eric & Guidoti, Marcus', 1],
    ['Göllner-Scheiding, Ursula', 17],
    ['Heiss, Ernst & Eckelt, Andreas & Lederwasch, Manfred', 7],
    ['Krüger, Andreas & Deckert, Jürgen', 1],
    ['Çerçý, Bariş & Gorczyca, Jacek & Koçak, Özgür', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=54)',
    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);