function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 2],
    ['Ivkovic, Marija & Perovic, Marija & Grootaert, Patrick', 3],
    ['Ivković, Marija & Gračan, Romana & Horvat, Bogdan', 7],
    ['Ivković, Marija & Čorkalo, Marko & Tkoč, Michal', 5],
    ['Kazerani, F. & Shamshev, I. V. & Morinière, J. & Thorn, S.', 2],
    ['Liu, Xiaoyan & Wang, Mengqing & Yang, Ding', 4],
    ['Sinclair, Bradley J. & Plant, Adrian R.', 9],
    ['Sinclair, Bradley J. Dr. & Evenhuis, Neal L.', 2],
    ['Słowińska, Iwona', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=35)',
    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);