function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hänggi, Ambros & Gloor, Daniel', 1],
    ['Lin, Yejie & Zhao, Huifeng & Koh, Joseph K H & Li, Shuqiang', 2],
    ['Marjan Komnenov & Eva Pitta & Konstantina Zografou', 1],
    ['Naumova, Maria & Blagoev, Gergin & Deltshev, Christo', 1],
    ['Russell-Smith, Anthony', 2],
    ['Sankaran, Pradeep M. & Caleb, John T. D.', 4],
    ['Zamani, Alireza & Chatzaki, Maria & Esyunin, Sergei L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);