function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bariche, Michel & Fricke, Ronald', 1],
    ['Carneiro, Miguel & Martins, Rogélia & Landi, Monica', 6],
    ['Cooper, David & Yamaguchi, Nobuyuki & Macdonald, David', 1],
    ['Engin, Semih & Innal, Deniz', 1],
    ['Engin, Semih & Seyhan, Dilruba', 1],
    ['Kovačić, Marcelo & Renoult, Julien P. & Pillon, Roberto', 10],
    ['Miller, Peter J.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    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);