function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Haupt, Joachim', 2],
    ['Haupt, Joachim & Song, Da-Xiang', 1],
    ['Kraepelin, Karl', 2],
    ['Pocock, Reginald Innes', 3],
    ['Schwangart, F.', 1],
    ['Seraphim, Gabriel & Giupponi, Alessandro Ponce de Leao', 2],
    ['Speijer, E. A. M.', 1],
    ['Tarnani, J.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);