function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Keller, Oliver & Branham, Marc A.', 3],
    ['Martin, Gavin J. & Powell, Gareth S.', 3],
    ['Martin, Gavin J. & Saxton, Natalie A.', 3],
    ['Pérez-Hernández, Cisteil Xinum', 1],
    ['Silveira, Luiz F L & Khattar, Gabriel & Vaz, Stephanie', 3],
    ['Zaragoza-Caballero, Santiago & Zurita-García, Martín Leonel', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=14)',
    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);