function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Etemadi, Isa & Asadi, Mahdieh', 1],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 1],
    ['Pešic, V. & Smit, H.', 1],
    ['Pešić, Vladimir & Chatterjee, Tapas & Bordoloi, Sabitry', 6],
    ['Pešić, Vladimir & Gerecke, Reinhard', 1],
    ['Pešić, Vladimir & Smit, Harry & Mary, Nathalie', 1],
    ['Smit, Harry', 1],
    ['Smit, Harry & Pesic, Vladimir & Mary-Sasal, Nathalie', 1],
    ['Smit, Harry & Pešić, Vladimir', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    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);