function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barjadze, Shalva', 4],
    ['Nieto Nafria, Juan M. & Blackman, Roger L. & Martin, Jon H.', 2],
    ['Nieto Nafria, Juan-Manuel & Mier Durante, Milagros-Pilar', 6],
    ['Nieto Nafría, Juan Manuel & Mier Durante, Milagros-Pilar', 6],
    ['Victor & Eastop, F. & Blackman, Roger L.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);