function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Callmander, Martin W.', 2],
    ['Callmander, Martin W. & Booth, Thomas J. & Beentje, Henk', 7],
    ['Callmander, Martin W. & Buerki, Sven', 8],
    ['Callmander, Martin W. & Buerki, Sven & Keim, Ary P.', 4],
    ['Callmander, Martin W. & Gallaher, Timothy & Buerki, Sven', 2],
    ['Callmander, Martin W. & Keim, Ary P. & Buerki, Sven', 4],
    ['Callmander, Martin W. & Lowry Ii, Porter P. & Forest, Félix', 52],
    ['Kanehira, Ryozo', 4],
    ['Laivao, Michel O. & Callmander, Martin W. & Buerki, Sven', 12],
    ['Martelli, Ugolino', 3],
    ['Merrill, Elmer Drew & Perry, Lily May', 23],
    ['Solms-Laubach, Hermann Maximilian Carl Ludwig Friedrich zu', 3],
    ['St John, H.', 26],
    ['Stone, Benjamin Clemens Masterman', 14],
    ['von Martelli, U.', 4],
    ['Other (17)', 18]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=186)',
    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);