function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fabricius, Johann Christian', 1],
    ['Fent, Meral & Kment, Petr & Çamur-Elipek, Belgin & Kirgiz, Timur', 3],
    ['Ghahari, Hassan & Moulet, Pierre & Ostovan, Hadi', 1],
    ['Kment, Petr & Kolínová, Zdislava', 2],
    ['N. N. Vinokurov', 9],
    ['Norbiato, Margherita & Dioli, Paride & Cianferoni, Fabio', 1],
    ['Sakenin, H. & Samin, N. & Rastegari, J. & Havaskary, M.', 1],
    ['Vinokurov, Nikolay N.', 1],
    ['Vinokurov, Nikolay N. & Kment, Petr', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    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);