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Correction
Miller LE, Grifka J, Schölmerich J, Straub RH. Norepinephrine from synovial tyrosine hydroxylase positive cells is a strong indicator of synovial inflammation in rheumatoid arthritis. J Rheumatol 2002;29:427-35. The area of a field of view at 400´ magnification was calculated incorrectly. The stated densities of the histological measures should be divided by 6.2 to calculate the correct number of structures per mm2. The densities of macrophages, T cells, tyrosine hydroxylase positive cells, and collagen IV positive blood vessels were incorrect. The results and conclusions of the study are not affected by this mathematical miscalculation. We regret the error.
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