These are two sites that discuss this subject. I have never come across this personally, but it is an interesting topic.

http://www.fpnotebook.com/OB63.htm
http://rad.usuhs.mil/medpix/tf_case....=no&pt_id=9434

KS x

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Kentish Spitfire
Moderator, Student Services
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"It's better to be thought a fool - rather than proved a fool!"