function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['- & Grosser, Clemens', 1],
    ['Ahmed, Raja Ben & Bielecki, Aleksander & Cichocka, Joanna M.', 2],
    ['Ahmed, Raja Ben & Romdhane, Yasmina & Tekaya, Saïda', 2],
    ['Darabi-Darestani, Kaveh & Sari, Alireza & Sarafrazi, Alimorad', 6],
    ['Delfosse, Emmanuel & Cliquennois, Nicolas & Depraetere, Marion', 1],
    ['Grosser, Clemens & Barjadze, Shalva & Maghradze, Eter', 2],
    ['Grosser, Clemens & Nesemann, Hasko F. & Ć, Vladimir Peši', 1],
    ['Grosser, Clemens & Pešić, Vladimir & Dmitrović, Dejan', 1],
    ['Grosser, Clemens & Pešić, Vladimir & Gligorović, Bogić', 5],
    ['Schenková, Jana & Sychra, Jan & Košel, Vladimír & Kubová, Nela', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    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);