function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annales de la Societe Entomologique de Belgique', 1],
    ['Asian Myrmecology', 1],
    ['Belgian Journal of Entomology', 1],
    ['Biodiversity Data Journal', 7],
    ['British Museum', 5],
    ['Entomologische Mitteilungen', 1],
    ['Far Eastern Entomologist', 5],
    ['Fauna Entomologica Scandinavica', 2],
    ['Journal of Hymenoptera Research', 1],
    ['Proceedings of the Institute of Zoology', 1],
    ['ZooKeys', 3],
    ['Zoosystema', 1],
    ['Zootaxa', 42]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=71)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);