function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Batelka, Jan & Hájek, Jiří', 3],
    ['Bologna, M. A. & Pinto, J. D.', 1],
    ['Bologna, Marco A. & Turco, Federica', 5],
    ['Fabricius, Johann Christian', 1],
    ['Ghahari, H. & Havaskary, M. & Tabari, M. & Ostovan, H.', 5],
    ['Pan, Zhao & Bologna, Marco A.', 27],
    ['Pan, Zhao & Ren, Guo-Dong', 2],
    ['Pan, Zhao & Ren, Guodong', 3],
    ['Serri, Sayeh & Pan, Zhao & Bologna, Marco A.', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1],
    ['Černý, Ladislav & Vrabec, Vladimír', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=51)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);