function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 3],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 3],
    ['Essl, F. & Stöhr, O.', 1],
    ['Ferrer-Gallego, P. Pablo', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 7],
    ['Info Flora', 7],
    ['Jarvis, Charlie', 3],
    ['Jeanmonod, Daniel', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 6],
    ['Melzer, H. & Barta, Th.', 1],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 5],
    ['Tekşen, Mehtap & Erkul, Seher Karaman', 2],
    ['Zarrei, Mehdi & Wilkin, Paul & Chase, Mark W.', 35],
    ['Zarrei, Mehdi & Wilkin, Paul & Ingrouille, Martin J.', 22]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=98)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);