function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Australian zoologist', 1],
    ['Belgian Journal of Entomology', 5],
    ['Biodiversity Data Journal', 1],
    ['European Journal of Entomology', 2],
    ['European Journal of Taxonomy', 54],
    ['Far Eastern Entomologist', 19],
    ['Faunitaxys', 3],
    ['Proceedings of the Linnean Society of London, Zoology', 5],
    ['Revue Entomologique (Strasbourg)', 1],
    ['Revue Française d\'Entomologie, Nouvelle Série', 1],
    ['Studies on Neotropical Fauna and Environment', 3],
    ['The Entomologist', 3],
    ['Verhandlungen des Naturhistorisch-Medizinischen Vereins zu Heidelberg', 1],
    ['ZooKeys', 6],
    ['Zootaxa', 83]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=188)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);