function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blume, Carl Ludwig von', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Howell, Nathan & Krings, Alexander & Braham, Richard R', 4],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 19],
    ['Li, Zhi-Zhong & Wei, Neng & Liu, Yan & Chen, Jin-Ming', 1],
    ['Merrill, Elmer Drew & Perry, Lily May', 2],
    ['Pérez-Pérez, Miguel A. & Ayers, Tina J. & Amith, Jonathan D.', 1],
    ['Rollim, Isis De Mello & Coelho, Guilherme Peres', 12],
    ['Royen, Pieter van', 2],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 6],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=61)',
    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);