function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aquarien und Terrarien Zeitschrift', 2],
    ['Aquarienfreund', 1],
    ['Assoc. Killiphile Francophone Belge, Killi Contact', 1],
    ['Bulletin du Muséum National d’Histoire Naturelle, Série 2', 1],
    ['Ichthyological Exploration of Freshwaters', 1],
    ['Killi Kontakt', 1],
    ['Mémoires du Muséum national d\'Histoire naturelle', 1],
    ['Notulae Naturae', 1],
    ['Proceedings of the Academy of Natural Sciences of Philadelphia', 1],
    ['Revue de Zoologie et de Botanique Africaines', 3],
    ['Wochenschrift für Aquarien- und Terrarienkunde', 2],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=19)',
    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);