function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Indian Journal of Helminthology', 1],
    ['Indian Journal of Parasitology', 1],
    ['Indian Journal of Physical and Natural Sciences Section A', 1],
    ['Indian Journal of Zoology', 1],
    ['Indian Journal of Zootomy', 1],
    ['Norwegian Journal of Zoology', 1],
    ['Proceedings of the Helminthological Society of Washington', 1],
    ['Proceedings of the Indian Science Congress', 1],
    ['Proceedings of the National Institute of Sciences in India', 1],
    ['Rivista di Parassitologia', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=11)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);