function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Agarwal, G. P. & Agrawal, S. C.', 1],
    ['Agrawal, S. C. & Agarwal, G. P.', 1],
    ['Agrawal, S. C. & Sharma, S. K.', 1],
    ['Aken’Ova, T. O. & Cribb, Thomas H. & Bray, Rodney A.', 1],
    ['Bray, Rodney A.', 1],
    ['Gibson, David Ian & Bray, Rodney A. & Langdon, Jeremy S.', 1],
    ['Manter, Harold W.', 1],
    ['Martin, W. E.', 1],
    ['Ramadan, M. M.', 3],
    ['Shimazu, Takeshi & Machida, Masaaki', 2],
    ['Tripathi, A. K. & Jauhari, R. K.', 1],
    ['Wang, P. - q.', 1],
    ['Woolcock, V.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);