function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Balzan, L.', 8],
    ['Banks, Nathan', 3],
    ['Batuwita, Sudesh & Benjamin, Suresh P.', 2],
    ['Beier, Max', 3],
    ['Chamberlin, Joseph Conrad', 2],
    ['Chamberlin, Ralph V.', 1],
    ['Ellingsen, Edvard', 2],
    ['Koch, Ludwig Carl Christian', 2],
    ['Krajcovicova, Katarina & Ramage, Thibault & Jacq, Frederic A.', 1],
    ['Navás, Longinos', 1],
    ['Novák, János & Dányi, László', 1],
    ['Pavesi, Pietro', 1],
    ['Simon, Eugène', 5],
    ['Tömösváry, Ö.', 2],
    ['With, Carl Johannes', 3],
    ['Other (2)', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=39)',
    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);