function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arzanov, Yu. G. & Martynov, V. V. & Nikulina, T. V.', 7],
    ['Caldara, Roberto', 4],
    ['Caldara, Roberto & Casalini, Roberto & Baviera, Cosimo', 4],
    ['Caldara, Roberto & Toševski, Ivo', 13],
    ['Colonnelli, Enzo', 1],
    ['Douglas, Hume & Bouchard, Patrice & Anderson, Robert S.', 1],
    ['Gosik, Rafal & Caldara, Roberto & Tosevski, Ivo', 15],
    ['Yunakov, Nikolai & Nazarenko, Vitalij & Filimonov, Rostislav', 12],
    ['Ścibior, Radoslaw & Letowski, Jacek', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=58)',
    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);