function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Geiger, Daniel L.', 4],
    ['Geiger, Daniel L. & Goedert, James L.', 1],
    ['Geiger, Daniel L. & Marshall, Bruce A.', 2],
    ['Helwerda, Renate A. & Wesselingh, Frank P.', 2],
    ['Herbert, David G.', 4],
    ['Luca, Javier Di & Zelaya, Diego G.', 2],
    ['Mariottini, Paolo & Smriglio, Carlo & Oliverio, Marco', 1],
    ['Muratov, Igor V. & Heyns-Veale, Elodie', 2],
    ['Nolt, Jaya M.', 1],
    ['d\'Orbigny, Alcide', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);