function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Allman, George James', 2],
    ['Calder, Dale R.', 1],
    ['Galea, Horia R. & Schories, Dirk', 1],
    ['OLIVEIRA, OTTO M. P. & MIRANDA, THAÍS P. & ARAUJO, ENILMA M.', 2],
    ['Peña Cantero, A. L. & Vervoort, W.', 13],
    ['Peña Cantero, Álvaro L.', 3],
    ['Peña Cantero, Álvaro L. & Horton, Tammy', 1],
    ['Peña Cantero, Álvaro L. & Marzal, Marina Fresneda', 2],
    ['Soto, Joan J. & Peña, Álvaro L.', 3],
    ['ÁLVARO L. PEÑA CANTERO', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);