function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blackburn, T. & Cameron, P.', 3],
    ['Blackburn, T. & Kirby, William Forsell', 1],
    ['Blackburn, Thomas & Cameron, P.', 1],
    ['Cameron, P.', 1],
    ['Else, George R. & Bolton, Barry & Broad, Gavin R.', 8],
    ['Fabricius, Johann Christian', 24],
    ['Jacobs, Hans-Joachim & Liebig, Wolf-Harald', 5],
    ['Jahantigh, Fatemeh & Rakhshani, Ehsan & Mokhtari, Azizollah', 2],
    ['Schmid, C.', 1],
    ['Smith, Frederick', 1],
    ['Stetsun, Halyna', 1],
    ['Walker, Francis', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=51)',
    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);