function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annalen des Naturhistorischen Museums in Wien', 2],
    ['Annales de la Societe Entomologique de Belgique', 4],
    ['Biodiversity Data Journal', 2],
    ['Bollettino della Societa Entomologica Italiana', 1],
    ['Bulletin of the American Museum of Natural History', 4],
    ['Bulletin of the British Museum (Natural History) Entomology', 9],
    ['Deutsche Entomologische Zeitschrift', 1],
    ['Memoires de l\'Institut Francais d\'Afrique Noire', 2],
    ['Mitteilungen der Schweizerischen Entomologischen Gesellschaft', 1],
    ['Revue de Zoologie Africaine', 6],
    ['Voyage de Ch. Alluaud et R. Jeannel en Afrique Orientale (1911 - 1912). Résultats scientifiques. Hyménoptères', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=33)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);