function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Zoologica Sinica', 1],
    ['Acta Zootaxonomica Sinica', 2],
    ['Brazilian Journal of Biology', 1],
    ['Bulletin of the National Science Museum, Series A, Zoology', 1],
    ['California Fish and Game', 2],
    ['Helminthologia', 1],
    ['Journal of Fish Diseases', 1],
    ['Journal of Parasitology', 3],
    ['Quarterly journal of microscopical science, n. s.', 1],
    ['Revista Ibérica de Parasitología', 1],
    ['Revue suisse de Zoologie', 1],
    ['Roosevelt Wild Life Annals', 1],
    ['Sprawozdania Polsk Akad Umiej Krakow', 1],
    ['Systematic Parasitology', 1],
    ['Zoologischer Anzeiger', 2],
    ['Other (3)', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);