function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Baturina, N. S.', 1],
    ['Baturina, N. S. & Efstifeeva, S. S.', 1],
    ['Bemmoussat-Dekkak, Soumya & Abdellaoui-Hassaine, Karima', 2],
    ['Borges, Paulo A. V. & Gaspar, Clara', 2],
    ['Embacher, G. & Malicky, H. & A. E & R. A', 1],
    ['Ibrahimi, Halil & Gashi, Agim & Bilalli, Astrit & Musliu, Milaim', 6],
    ['Konovalova, Daria A. & Kislitsina, Nadezhda I.', 1],
    ['Malicky, H.', 1],
    ['Malicky, Hans', 1],
    ['Mey, Wolfram & Malicky, Hans', 1],
    ['Saini, Malkiat Singh & Parey, Sajad Hussain', 1],
    ['Salokannel, Juha & Lee, Kyung Min & Rinne, Aki & Mutanen, Marko', 2],
    ['Sipahiler, Füsun', 6],
    ['Waringer, Johann & Malicky, Hans', 1],
    ['Weidlich, M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);