function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['American Journal of Hygiene', 3],
    ['Canadian Journal of Zoology', 1],
    ['Dissertation', 1],
    ['Folia Parasitologica', 1],
    ['Havniae & Lipsiae', 8],
    ['Indian Journal of Medical Research', 1],
    ['Journal of Parasitology', 15],
    ['Journal of helminthology', 1],
    ['Journal of the Shanghai Science Institute, New Series', 1],
    ['Parasitologische Schriftenreihe', 1],
    ['Parasitology', 1],
    ['Proceedings of the Linnean Society of New South Wales', 1],
    ['Publications of the South African Institute of Medical Research', 1],
    ['The Biological Bulletin', 5],
    ['Zootaxa', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=44)',
    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);