function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Batelka, Jan & Hájek, Jiří', 8],
    ['Bologna, M. A. & Pinto, J. D.', 1],
    ['Bologna, Marco A. & Turco, Federica', 1],
    ['El-Hawagry, Magdi S. & Sharaf, Mostafa R. & Al Dhafer, Hathal M.', 1],
    ['Ruchin, Alexaner B. & Egorov, Leonid V. & Alekseev, Sergei K.', 1],
    ['Turco, Federica & Bologna, Marco A.', 30]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=42)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);