Kennedy, R.M., Luhmann, J., Zempsky, W.T. (2008). Clinical implications of unmanaged needle-insertion pain and distress in children. Pediatrics 122(Suppl. 3), S130-S133. doi: 10.1542/peds.2008-1055e. http://pediatrics.aappublications.org/content/pediatrics/122/Supplement_3/S130.full.pdf.