function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Akkemik, Ünal & Bayam, Nevriye Neslihan Acarca', 2],
    ['Becherer', 7],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 4],
    ['Chen, Ronglian & Zhang, Faqi & Chen, Shilong & Chi, Xiaofeng', 5],
    ['Essl, F. & A, Lower & A, Lower', 3],
    ['Essl, F. & Stöhr, O.', 4],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 4],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 6],
    ['Info Flora', 14],
    ['Jarvis, Charlie', 18],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 8],
    ['Martinetto, Edoardo & Bertini, Adele & Mantzouka, Dimitra', 12],
    ['Sakala, Jakub & Selmeczi, Ildikó & Hably, Lilla', 6],
    ['Suh, Soo-Jung', 6],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 6],
    ['Other (30)', 40]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=145)',
    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);