function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 1],
    ['Danylyk, Ivan M. & Koopman, Jacob', 1],
    ['Elliott, T. L. & Barrett, R. L. & Muasya, A. M.', 13],
    ['Elliott, T. L. & Muasya, A. M.', 55],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 3],
    ['Info Flora', 2],
    ['Jarvis, Charlie', 3],
    ['Kern, Friedrich', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Larridon, I. & Verboom, G. A. & Muasya, A. M.', 1],
    ['Linnaeus, Carolus', 9],
    ['Schlechter, Fridrich Richard Rudolf', 2],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Wittmann, H. & Hohla, M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=94)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);