function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Banks, Nathan', 1],
    ['Bertrand, M. & Pfliegler, W. P. & Sciberras, A.', 2],
    ['Fajfer, Monika', 2],
    ['Lawrence, Reginald Frederick', 1],
    ['Machado, Ingrid B. & Gazêta, Gilberto S. & Pérez, José', 4],
    ['Paredes-León, Ricardo & García-Prieto, Luis', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=14)',
    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);