function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cadena-Castañeda, Oscar J.', 6],
    ['Cadena-Castañeda, Oscar J. & Gutiérrez, Yeisson & Bacca, Tito', 1],
    ['Frank, J. H. & McCoy, Earl D.', 1],
    ['Frank, J. H. & Vicente, N. E. & Leppla, N. C.', 1],
    ['Hollier, John & Bruckner, Harald & Heads, Sam W.', 1],
    ['Sperber, Carlos Frankl', 1],
    ['Yong, Sheyla & Perez-Gelabert, Daniel E.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);