function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bertin, L.', 1],
    ['Bleeker, Pieter', 1],
    ['Derscheid, J. M.', 1],
    ['Edwards, A. J. & Gill, A. C. & Abohweyere, P. O.', 1],
    ['Hildebrand, S. F.', 1],
    ['Kailola, Patricia J.', 1],
    ['Nakashima, S.', 2],
    ['Randall, John Ernest Dr.', 1],
    ['Richardson, John', 1],
    ['Seshagiri Rao, B. V.', 1],
    ['Wongratana, Thosaporn', 1],
    ['Zainal Abidin, Danial Hariz & Lavoué, Sébastien', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);