function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Boulenger, George Albert', 1],
    ['Crass, R. S.', 1],
    ['Daget, J.', 1],
    ['Daget, J. & Stauch, A.', 1],
    ['Friel, John P. & Vigliotta, Thomas R.', 5],
    ['Jubb, R. A. & Le Roux, P.', 2],
    ['Ladiges, W. & Voelker, J.', 1],
    ['Matthes, H.', 1],
    ['Pellegrin, J.', 3],
    ['Poll, M.', 2],
    ['Roberts, Tyson R.', 4],
    ['Schmidt, Ray C & Bart, Henry L. & Pezold, Frank L.', 9],
    ['Schmidt, Ray C. & Bart Jr, Henry L. & Nyingi, Wanja Dorothy', 6],
    ['Seegers, Lothar', 2],
    ['de Vos, L.', 2],
    ['Other (8)', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=49)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);