function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Essl, F. & A, Lower & A, Lower', 1],
    ['Friis, Else Marie & Crane, Peter R. & Pedersen, Kaj Raunsgaard', 5],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 2],
    ['Iamandei, Stanila & Iamandei, Eugenia & Stoia, Tiberiu', 1],
    ['Iamandei, Stanila & Iamandei, Eugenia & Todea, Petru', 1],
    ['Info Flora', 2],
    ['Jarvis, Charlie', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Kovar-Eder, Johanna & Kvaček, Zlatko & Teodoridis, Vasilis', 1],
    ['Kvaček, Zlatko & Teodoridis, Vasilis & Radoň, Miroslav', 1],
    ['Martinetto, Edoardo & Bertini, Adele & Mantzouka, Dimitra', 1],
    ['Reveal, James L. & Chase, Mark W. & Iii, - Apg & Iii, Apg', 1],
    ['Sakala, Jakub & Selmeczi, Ildikó & Hably, Lilla', 1],
    ['Wheeler, Elisabeth A. & Manchester, Steven R.', 2],
    ['Other (5)', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    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);