function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Embacher, G. & Malicky, H. & A. E & R. A', 1],
    ['Ibrahimi, Halil & Kučinić, Mladen & Vitecek, Simon', 2],
    ['Ibrahimi, Halil & Mohammadi, Habibollah & Ghaderi, Edris', 1],
    ['Ibrahimi, Halil & Vitecek, Simon & Previsic, Ana', 1],
    ['Posilović, Hrvoje', 2],
    ['Vitecek, Simon & Kucinic, Mladen & Olah, Janos & Previsic, Ana', 9],
    ['Vitecek, Simon & Kučinić, Mladen & Previšić, Ana & Živić, Ivana', 1],
    ['Vitecek, Simon & Martini, Jan & Zittra, Carina', 1],
    ['Vitecek, Simon & Previsic, Ana & Kucinic, Mladen', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    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);