function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bhattacharyya, Asit K.', 1],
    ['Bolger, Thomas & Arroyo, Julio & Piotrowska, Katarzyna', 1],
    ['Chen, Wan-Peng & Gao, Ping', 2],
    ['Farrier, M. H.', 1],
    ['Khalili-Moghadam, A. & Saboori, A.', 1],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 5],
    ['Lin, Jian-Zhen', 8],
    ['Ma, Min & Li, Sheng-Cai & Fan, Qing-Hai', 2],
    ['Mašán, Peter & Grazyna & Madej', 2],
    ['Nemati, A. & Gwiazdowicz, D. J. & Riahi, E. & Mohseni, M.', 5],
    ['Nemati, Alireza & Riahi, Elham & Khalili-Moghadam, Arsalan', 3],
    ['Willmann, C.', 2],
    ['Án, Peter Ma Š & A, Peter Fen Ď & Mihál, Ivan', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=37)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);