function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gupta, P. C. & Singh, R. B.', 1],
    ['Gupta, R. C. & Gupta, S. P.', 2],
    ['Gupta, V. & Ahmad, J.', 2],
    ['Li, Daoning & Sun, Yat-sen', 1],
    ['Margarita Ostrowski de Núñez & Nathalia J. Arredondo', 1],
    ['Pandey, K. C. & Tewari, S. K.', 1],
    ['Shen, J. - w.', 1],
    ['Siddiqi, Ather H. & Hafeezullah, M.', 1],
    ['Srivastava, H. D.', 1],
    ['Tanzola, Ruben Daniel & Seguel, Silvana', 1],
    ['Verma, S. L.', 1],
    ['Yamaguti, S.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=14)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);