function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cadena-Castañeda, Oscar J. & Rodríguez, William David', 1],
    ['De, Francisco De A. G. & Morselli, João Paulo', 2],
    ['Hollier, John & Bruckner, Harald & Heads, Sam W.', 2],
    ['Orsini, Marcelo Pinheiro & Costa, Maria Kátia Matiotti Da', 4],
    ['Sultana, Riffat & Sanam, Surriya & Kumar, Santosh', 1],
    ['Zefa, Edison & Martins, Luciano De Pinho', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    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);