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RT @KDAO2011: #acr19 @rheumnow Hench Lecture w/Dr J Reveille on back pain to HLA B2720% of people 20-50 yrs old in US have chronic back pa…

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#acr19 @rheumnow Hench Lecture w/Dr J Reveille on back pain to HLA B27 20% of people 20-50 yrs old in US have chronic back pain. How many of you have back pain now?

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