function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['C. O & Madl, M. & Olmi, M.', 3],
    ['Derafshan, Hossein Ali & Olmi, Massimo', 2],
    ['Olmi, Massimo & Copeland, Robert S. & Guglielmino, Adalgisa', 2],
    ['Olmi, Massimo & Copeland, Robert S. & Noort, Simon Van', 3],
    ['Olmi, Massimo & van Noort, Simon & Guglielmino, Adalgisa', 2],
    ['Xu, Zaifu & Olmi, Massimo & Guglielmino, Adalgisa & Chen, Huayan', 4],
    ['Xu, Zaifu & Olmi, Massimo & He, Junhua', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);