function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aspoeck, Ulrike & Liu, Xingyue & Aspoeck, Horst', 6],
    ['Hassan, Muhammad Asghar & Oswald, John D. & Zia, Ahmed', 2],
    ['Li, Di & Aspöck, Horst & Aspöck, Ulrike & Liu, Xingyue', 17],
    ['Zhang, Wei & Liu, Xingyue & Aspoeck, Horst & Winterton, Shaun L.', 14],
    ['Zhang, Wei & Liu, Xingyue & Aspöck, Horst & Aspöck, Ulrike', 36],
    ['Zhang, Wei & Liu, Xingyue & Winterton, Shaun L. & Aspöck, Horst', 13]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=88)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);