function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bhutta, M. S. & Khan, D.', 1],
    ['Fernandes, Berenice M. M. & Souza, Santiago V. De', 1],
    ['Gupta, A. N. & Sharma, P. N.', 1],
    ['Gupta, S. P. & Gupta, R. C.', 1],
    ['Gupta, S. P. & Srivastava, A. B.', 3],
    ['Gupta, V. & Ahmad, J.', 2],
    ['Lokhande, L. U.', 1],
    ['Manter, Harold W.', 1],
    ['Pandey, K. C. & Tewari, S. K.', 1],
    ['Ramadan, M. M.', 1],
    ['Shen, J. - w.', 2],
    ['Srivastava, H. D.', 3],
    ['Varma, P. K. & Singh, J. P.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);