function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Appolloni, Massimo & Smriglio, Carlo & Amati, Bruno', 1],
    ['Geiger, Daniel L.', 2],
    ['Geiger, Daniel L. & Fernández-Garcés, Raúl', 2],
    ['Geiger, Daniel L. & Jansen, Patty', 12],
    ['Geiger, Daniel L. & Marshall, Bruce A.', 5],
    ['Geiger, Daniel L. & Mclean, James H.', 9],
    ['Gofas, Serge & Luque, Ángel A. & Oliver, Joan Daniel', 5],
    ['Hansen, Thomas', 3],
    ['Helwerda, Renate A. & Wesselingh, Frank P.', 3],
    ['Herbert, David G.', 7],
    ['Hoffman, Leon & Kniesz, Katharina & Arbizu, Pedro Martínez', 5],
    ['Leal, José H.', 1],
    ['Muratov, Igor V. & Heyns-Veale, Elodie', 2],
    ['Negri, Mauro Pietro & Corselli, Cesare', 1],
    ['Ortega, José Rafael & Gofas, Serge', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=62)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);