function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 57],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 6],
    ['Chen, Feng & He, Hai', 2],
    ['Denk, Thomas & Sami, Marco & Teodoridis, Vasilis', 5],
    ['Gillespie, Lynn J. & Saarela, Jeffery M. & Sokoloff, Paul C.', 2],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 4],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 35],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 4],
    ['Info Flora', 39],
    ['Jarvis, Charlie', 33],
    ['Jeanmonod, Daniel & Schlüssel, André', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 33],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 6],
    ['Percy, Diana M. & Rung, Alessandra & Hoddle, Mark S.', 13],
    ['Stöhr, O. & Pilsl, P. & Essl, F. & Hohla, M. & Schröck, C.', 4],
    ['Other (13)', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=260)',
    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);