function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmed, Raja Ben & Romdhane, Yasmina & Tekaya, Saïda', 1],
    ['Fedorova, Lyudmila I. & Kaygorodova, Irina A.', 1],
    ['Gouda, Hanaa A.', 1],
    ['Grosser, Clemens & Pešić, Vladimir & Gligorović, Bogić', 2],
    ['Jueg, Uwe', 2],
    ['Kaygorodova, Irina A.', 3],
    ['Klass, Anna L. & Sokolova, Svetlana E. & Kondakov, Alexander V.', 1],
    ['Madill, Jacqueline & Hovingh, Peter', 1],
    ['Moser, William E. & Richardson, Dennis J.', 1],
    ['Schenková, Jana & Sychra, Jan & Košel, Vladimír & Kubová, Nela', 3],
    ['Šatkauskienė, Ingrida & Rutkauskaitė-Sucilienė, Jurgita', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);