function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bilqees, Fatima Mujib & Nighat, Yasmin', 1],
    ['Fischthal, Jacob H. & Kuntz, Robert E', 1],
    ['Gu, Chang-dong & Shen, J. - w.', 1],
    ['Gupta, S. P. & Gupta, R. C.', 1],
    ['Linton, E.', 2],
    ['Looss, A.', 2],
    ['Manter, Harold W.', 1],
    ['Margarita Ostrowski de Núñez & Nathalia J. Arredondo', 1],
    ['McFarlane, S. Hanford', 1],
    ['Nadakal, A. M. & Kappikarayil, J. O. & Jacob, A.', 1],
    ['Rekha, R. Y. & John, M. V.', 1],
    ['Yamaguti, S.', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    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);