function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Davranoglou, Leonidas-Romanos & Baňař, Petr', 1],
    ['Hlaváč, Peter', 1],
    ['Löbl, Ivan & Kodada, Ján', 3],
    ['Owens, Brittany E. & Carlton, Christopher E.', 20],
    ['Sabella, Giorgio & Viglianisi, Fabio Massimo', 3],
    ['Théry, T. & Leschen, Richard A. B.', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=32)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);