function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Al-Khazali, Azhar Mohammed & Kachel, Hamid Saeid', 2],
    ['Bernhard A. Huber & Charles M. Warui', 3],
    ['Bernhard A. Huber & Philippe Le Gall', 2],
    ['Dean, David Allen', 1],
    ['Huber, Bernhard A.', 30],
    ['Huber, Bernhard A. & Colmenares, Pío A. & Ramirez, Martin J.', 1],
    ['Huber, Bernhard A. & Kwapong, Peter', 3],
    ['Huber, Bernhard A. & Villarreal, Osvaldo', 2],
    ['Jäger, Peter', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=45)',
    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);