function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Brusa, Francisco & Damborenea, Cristina', 2],
    ['Bulnes, V. N. & Faubel, A. & Park, J. - K.', 2],
    ['Faubel, Anno', 3],
    ['Holleman, John J.', 1],
    ['Marquina, Daniel & Osca, David & Rodríguez, Jorge', 1],
    ['Rodríguez, Jorge & Hutchings, Pat A. & Williamson, Jane E.', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);