function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Juanjuan & Schmelz, Rüdiger M. & Zhang, Zuxu & Xie, Zhicai', 1],
    ['Christoffersen, Martin L.', 1],
    ['Dozsa-Farkas, Klara & Felfoeldi, Tamas & Nagy, Hajnalka', 1],
    ['Dózsa-Farkas, Klára & Felföldi, Tamás & Hong, Yong', 2],
    ['Dózsa-Farkas, Klára & Felföldi, Tamás & Nagy, Hajnalka', 2],
    ['Rota, Emilia', 5],
    ['Schmelz, Rüdiger M. & Chen, Juanjuan & Józefowska, Agnieszka', 2],
    ['Schmelz, Rüdiger M. & Collado, Rut & Römbke, Jörg', 5],
    ['Schmelz. R. M. & Collado, R.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);