function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Frey-da-Silva, Angélica & Grazia, Jocélia', 5],
    ['Ghahari, Hassan & Moulet, Pierre & Rider, David A.', 5],
    ['Károlyi, Balázs & Rédei, Dávid', 1],
    ['Külekçi, G. & Yildirim, E. & Tezcan, S.', 1],
    ['Laterza, Ilaria & Tamburini, Giovanni & Panzarino, Onofrio', 2],
    ['Linnavuori, Rauno E.', 6],
    ['Panizzi, Antônio Ricardo & Grazia, Jocélia', 2],
    ['Powell, Erin C. & Halbert, Susan E. & Deeter, Lily', 1],
    ['Schwertner, Cristiano Feldens & Grazia, Jocélia', 2],
    ['Tezcan, S. & Gulpercin, N. & Fent, M.', 2],
    ['Yazici, G. & Yildirim, E. & Moulet, P.', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    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);