function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bulletin of the United States Bureau of Fisheries', 1],
    ['Crustaceana', 1],
    ['Mémoires du Muséum National d’Histoire Naturelle', 13],
    ['Mémoires du Muséum National d’Histoire Naturelle, Série A, Zoologie', 1],
    ['New Zealand journal of zoology', 1],
    ['Proceedings of the United States National Museum', 2],
    ['Ray Society', 1],
    ['Records of the oceanographic works in Japan', 1],
    ['Videnskabelige Meddelelser fra Dansk Naturhistoriske Forening i Kjøbenhavn', 1],
    ['ZooKeys', 1],
    ['Zoological Journal of the Linnean Society', 4],
    ['Zoosystema', 1],
    ['Zootaxa', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=31)',
    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);