http://content.nejm.org/cgi/content/full/351/2/117
http://www.jltgroup.com/default.asp?docId=15676
http://articles.latimes.com/2001/nov/29/news/mn-9375
http://www.globalsecurity.org/military/library/news/2005/12/mil-051207-rferl02.htm
http://www.breakingnews.ie/archives/?c=WORLD&jp=mhojojsnidsn&d=2008-04-03
http://www.npr.org/templates/story/story.php?storyId=93823508