function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 1],
    ['Essl, F. & A, Lower & A, Lower', 2],
    ['Fiorito, Serena & Epifano, Francesco & Preziuso, Francesca', 1],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 1],
    ['Guo, Xin-Qiang & Wang, Long & Yang, Qin-Er', 7],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 22],
    ['Info Flora', 23],
    ['Jarvis, Charlie', 21],
    ['Jin, Guang-Zhao & Sheludyakova, Mariya & Li, Wen-Jun', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 16],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 11],
    ['Percy, Diana M. & Rung, Alessandra & Hoddle, Mark S.', 3],
    ['Sokoloff, Paul C. & Freebury, Colin E. & Hamilton, Paul B.', 2],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Hohla, M. & Schröck, C.', 2],
    ['Suh, Soo-Jung', 4],
    ['Other (4)', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=121)',
    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);