function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Collins, Rupert A. & Duarte Ribeiro, Emanuell', 2],
    ['Koerber, Stefan & Guimarães, Erick Cristofore', 1],
    ['Litz, Thomas O. & The, Stefan Koerber Introduction', 1],
    ['Ota, Renata Rúbia & Deprá, Gabriel de Carvalho', 3],
    ['Uriel Angel Buitrago-Suárez & Brooks M. Burr', 11]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);