function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annuario del Museo Zoologico della Università di Napoli', 1],
    ['European Journal of Taxonomy', 4],
    ['Helminthologia', 2],
    ['Journal of Hymenoptera Research', 3],
    ['Journal of Parasitology', 1],
    ['Journal of helminthology', 1],
    ['Parasite', 7],
    ['Parasitology International', 1],
    ['Revue suisse de Zoologie', 10],
    ['Species Diversity', 1],
    ['Systematic Parasitology', 2],
    ['Vestnik Zoologii', 14],
    ['ZooKeys', 24],
    ['Zootaxa', 137]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=208)',
    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);