function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Altuna, Álvaro & López-González, Pablo J.', 1],
    ['Cairns, Stephen D.', 2],
    ['Pérez, Carlos Daniel & Zamponi, Mauricio Oscar', 1],
    ['Schejter, L. & Genzano, G. & Pérez, C. D. & Acuña, F.', 7],
    ['TAYLOR, M. L. & CAIRNS, S. D. & AGNEW, D. J. & ROGERS, A. D.', 26],
    ['Zapata-Guardiola, Rebeca & López-González, Pablo J.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=38)',
    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);