function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 2],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 16],
    ['Info Flora', 13],
    ['Jarvis, Charlie', 7],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 13],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 7],
    ['Linnaeus, Carolus', 5],
    ['Novikov, Andriy', 8],
    ['Novikov, Andriy & Mitka, Józef', 2],
    ['Sennikov, Alexander N.', 1],
    ['Singh, Harsh & Pradhan, Aditya & Adhikari, Dibyendu', 1],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Hohla, M. & Schröck, C.', 1],
    ['Vanderplanck, Maryse & Glauser, Gaétan', 1],
    ['Wang, Jun-Jie & Lou, Hua-Yong & Liu, Ying & Han, Hong-Ping', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=80)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);