function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Broad, Gavin R.', 4],
    ['Khalaim, Andrey I. & Ruíz-Cancino, Enrique', 3],
    ['Kolarov, J.', 1],
    ['Liu, Jing-Xian & He, Jun-Hua & Chen, Xue-Xin', 17],
    ['Pham, Nhi Thi & Broad, Gavin R. & Wägele, Wolfgang J.', 8],
    ['Varga, Oleksandr', 2],
    ['Çoruh, S. & Özbek, H.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=36)',
    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);