function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gapp, I. Wesley & Lieberman, Bruce S.', 20],
    ['Gapp, Wesley & Lieberman, Bruce S. & Pope, Michael C.', 7],
    ['Laibl, Lukáš & Esteve, Jorge & Fatka, Oldřich', 4],
    ['Unger, Tanja & Hildenbrand, Anne & Stinnesbeck, Wolfgang', 6],
    ['Webster, Mark & Bohach, Lisa L.', 12],
    ['Żylińska, Anna & Kin, Adrian & Nowicki, Jakub', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=50)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);