function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adlbauer, K. & Ayalew, Amare & Beck, R. & Drumont, A.', 1],
    ['Behne, L & Gaedike, H', 1],
    ['Gupta, Rajeev & Vitali, Francesco', 10],
    ['Lee, Seunghyun & Oh, Seunghwan & Seung, Jinbae & Jang, Hyunkyu', 1],
    ['Li, Zhu & Chen, Li', 1],
    ['Wang, P. & Liu, M. - Y. & Xie, G. - L. & Wang, W. - K.', 3],
    ['Yokoi, Yaheita & Niisato, Tatsuya', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    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);