function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Universitatis Bergensis, Series Mathematica Rerumque Naturalium', 1],
    ['Bolletino della Società Adriatica di Scienze Naturali in Trieste', 1],
    ['Bulletin de l\'Institut Océanographique de Monaco', 1],
    ['Journal of Natural History', 1],
    ['Journal of Parasitology', 1],
    ['Transactions of the Royal Society of New Zealand', 1],
    ['Zootaxa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);