function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Agnarsson, Ingi', 1],
    ['Dean, David Allen', 1],
    ['Durán-Barrón, CÉSAR G. & Rosas, MARÍA V.', 1],
    ['Durán-Barrón, César G. & Rosas, María V.', 1],
    ['Gao, Cai-Xia & Li, Shu-Qiang', 3],
    ['Li, Fengyuan & Lin, Yejie & Gao, Fan & Yao, Yanbin', 3],
    ['Santanna, Manoela & Rodrigues, Everton Nei Lopes', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);