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Old 09-10-2007, 10:12 PM
HeyJoe HeyJoe is offline
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Join Date: Sep 2006
Location: New York
Posts: 461
15 yr Member
HeyJoe HeyJoe is offline
Member
 
Join Date: Sep 2006
Location: New York
Posts: 461
15 yr Member
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I think it is because the cause of their PN is known(diabetes), so during a study knowing the cause eliminates an important variable and makes it more scientifically valid.
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