function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abdel-Dayem, Mahmoud S. & Fad, Hassan H. & El-Torkey, Ashraf M.', 1],
    ['Alarie, Yves', 2],
    ['Budaev, F. A. & Eremeeva, N. I. & Efimov, D. A.', 7],
    ['Darilmaz, Mustafa C. & Kiyak, Suat', 11],
    ['Ewalka & Pešić, V. & Darvishzadeh, I.', 1],
    ['Fery, Hans', 2],
    ['Fery, Hans & Challet, Gil', 1],
    ['Hájek, Jiří', 2],
    ['Hájek, Jiří & Reiter, Antonín', 2],
    ['Lamelas-López, Lucas & Raposeiro, Pedro Miguel', 1],
    ['Prokin, A. A. & Sazhnev, A. S.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    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);