function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 310],
    ['C. O & Madl, M. & Olmi, M.', 30],
    ['Else, George R. & Bolton, Barry & Broad, Gavin R.', 22],
    ['Engler, Heinrich Gustav Adolf & Krause, Johann Wilhelm', 25],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 74],
    ['Info Flora', 66],
    ['Ito, Yu & Barfod, Anders S.', 80],
    ['Jarvis, Charlie', 85],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 58],
    ['Linnaeus, Carolus', 27],
    ['Oliveira, Adriana & Bove, Claudia', 42],
    ['Olmi, Massimo & Copeland, Robert S. & Noort, Simon Van', 149],
    ['Ortiz, Orlando Oriel & de Stapf, María Sánchez', 80],
    ['Wong, Sin Yeng & Joling, Jyloerica', 105],
    ['Xu, Zaifu & Olmi, Massimo & He, Junhua', 26],
    ['Other (151)', 561]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=1740)',
    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);