function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bray, Rodney A. & Justine, Jean-Lou', 1],
    ['Gu, Chang-dong & Shen, J. - w.', 1],
    ['Gupta, A. N. & Sharma, P. N.', 1],
    ['Gupta, P. C. & Gupta, V. C.', 1],
    ['Gupta, S. P. & Tandon, V. L.', 1],
    ['Gupta, V. & Jain, N.', 2],
    ['Hafeezullah, M. & Siddiqi, Ather H.', 1],
    ['MacCallum, G. A.', 1],
    ['Madhavi, R.', 1],
    ['Manter, Harold W.', 1],
    ['Nagaty, H. F.', 1],
    ['Nahhas, Fuad M. & Cable, Raymond M.', 1],
    ['Velasquez, Carmen C.', 1],
    ['Zaidi, Daulat Ali & Khan, Daler', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);