function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['AL-Shehbaz, Ihsan A. & Barriera, Gabrielle', 3],
    ['Delgado, Leonardo', 1],
    ['Delgado, Leonardo & Toledo-Hernandez, Victor Hugo', 3],
    ['Freese, Edwin L. & Veal, Doug A. & Lago, Paul K.', 7],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 5],
    ['Info Flora', 4],
    ['Jarvis, Charlie', 5],
    ['Johnston, M. Andrew & Waite, Evan S. & Wright, Ethan R', 4],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 3],
    ['Pérez-Hernández, Cisteil Xinum', 20]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=55)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);