function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Kočić, Anja & Vujić, Ante & Tot, Tamara', 6],
    ['Lorenzo, Daniel & Ricarte, Antonio & Nedeljković, Zorica', 1],
    ['MAZáNEK, Libor & VONIČKA, Pavel & PREISLER, JiřÍ', 7],
    ['Mutin, V. A.', 2],
    ['Mutin, V. A. & Barkalov, A. V.', 2],
    ['Ricarte, Antonio & Rotheray, Graham E. & Lyszkowski, Richard M.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);