function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Baer, J. G.', 1],
    ['Borgarenko, L. F.', 1],
    ['Buckley, J. J. C. & Yeh, L. S.', 1],
    ['Fischthal, Jacob H.', 1],
    ['Gogate, B. S.', 1],
    ['Gupta, R.', 1],
    ['Gupta, S. P. & Khan, A. H.', 1],
    ['Kalyankar, S. D. & Tagade, A. M.', 1],
    ['Ravikumar, S. & Vijayalakshmi, V. & Hanumantha Rao, K.', 1],
    ['Singh, S. N.', 1],
    ['Talbot, N.', 1],
    ['Tokobaev, M. M. & Chibichenko, N. T.', 1],
    ['Tubangui, Marcos A.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);