function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arthropod fauna of the UAE', 1],
    ['Berliner Entomologische Zeitschrift', 2],
    ['Biodiversity Data Journal', 2],
    ['Entomologische Mitteilungen', 1],
    ['Fragmenta entomologica', 1],
    ['Journal of the Bombay Natural History Society', 2],
    ['Papéis Avulsos de Zoologia', 1],
    ['Revista de Entomologia, São Paulo', 2],
    ['Transactions of the Entomological Society of London', 3],
    ['Verhandlungen der Zoologisch-Botanischen Gesellschaft in Wien', 1],
    ['ZooKeys', 1],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);