function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annalen des Naturhistorischen Museums in Wien', 1],
    ['Annales de la Societe Entomologique de Belgique', 3],
    ['Annales de la Société Entomologique de France', 4],
    ['Biodiversity Data Journal', 3],
    ['British Museum', 4],
    ['Bulletin of the American Museum of Natural History', 6],
    ['Deutsche Entomologische Zeitschrift', 1],
    ['Memoires de l\'Institut Francais d\'Afrique Noire', 3],
    ['Mitteilungen der Schweizerischen Entomologischen Gesellschaft', 1],
    ['Raffles Bulletin of Zoology', 4],
    ['Revista de Entomologia', 1],
    ['Verhandlungen der Zoologisch-Botanischen Gesellschaft in Wien', 3],
    ['Voyage de Ch. Alluaud et R. Jeannel en Afrique Orientale (1911 - 1912). Résultats scientifiques. Hyménoptères', 5],
    ['Zootaxa', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);