function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alexander, C. P.', 1],
    ['Armitage, Brian J. & Ríos González, Tomás A.', 1],
    ['Ribeiro, Guilherme C. & Santos, Daubian', 2],
    ['Ribeiro, Guilherme Cunha', 11],
    ['Ribeiro, Guilherme Cunha & Lamas, Carlos José Einicker', 1],
    ['Theischinger, Günther & D, Zacariah & Martin, John', 21]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=37)',
    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);