function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adler, Peter H. & Crosskey, Roger W.', 2],
    ['Craig, Douglas A.', 1],
    ['Craig, Douglas Abercrombie McBeath & Craig, Ruth E. G.', 4],
    ['Crosby, Trevor Keith', 1],
    ['Davies, D. M. & Györkös, H.', 1],
    ['Dumbleton, Lionel Jack', 6],
    ['Tonnoir, A. L.', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);