function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alderwerelt van Rosenburgh, Capt. C. R. W. K.', 1],
    ['Blume, Carl Ludwig von', 3],
    ['Brause, Guido Georg Wilhelm', 4],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 1],
    ['Copeland, Edwin Bingham', 1],
    ['Jarvis, Charlie', 1],
    ['Karger, Dirk Nikolaus & Lehtonen, Samuli & Amoroso, Victor B.', 1],
    ['Kramer, Wilhelm Heinrich', 4],
    ['Matos, Fernando B. & Bohn, Amabily & Labiak, Paulo H.', 1],
    ['Rosenstock, Eduard', 4],
    ['Smith, John', 1],
    ['Wagner, Warren Herbert & Grether, David Frank', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);