function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Balzan, L.', 2],
    ['Banks, Nathan', 4],
    ['Batuwita, Sudesh & Benjamin, Suresh P.', 1],
    ['Beier, Max', 15],
    ['Canestrini, Giovanni', 1],
    ['Chamberlin, Joseph Conrad', 7],
    ['Cockerell, Theodore D. A.', 1],
    ['Harvey, Mark S.', 18],
    ['Koch, Ludwig Carl Christian', 2],
    ['Mahnert, Volker', 6],
    ['Muchmore, William B.', 3],
    ['Novák, János & Dányi, László', 6],
    ['Redikorzev, V.', 2],
    ['Tullgren, Albert', 4],
    ['With, Carl Johannes', 3],
    ['Other (13)', 13]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=88)',
    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);