function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Kutuzović, Davorka Hackenberger', 1],
    ['Lehmitz, Ricarda & Römbke, Jörg & Jänsch, Stephan', 1],
    ['Plisko, Jadwiga D. & Nxele, Thembeka C.', 1],
    ['Plisko, Jadwiga Danuta', 1],
    ['Stojanović, Mirjana & Milutinović, Tanja', 1],
    ['Stojanović, Mirjana & Sekulić, Jovana & Trakić, Tanja', 1],
    ['Szederjesi, T.', 1],
    ['Szederjesi, Tímea & Csuzdi, Csaba', 1],
    ['Szederjesi, Tímea & Vavoulidou, Evangelia & Chalkia, Christina', 1],
    ['Valchovski, Hristo Ivailov', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);