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Individual localization of chronic nonspecific low back pain reported by the patients enrolled in this study. The arrows exemplarily indicate patients who reported pain from the first lumbar segment of the spine (L1) to the third lumbar segment of the spine (L3) (a), from L3 to the first sacral segment of the spine (S1) (b) or from the fifth lumbar segment of the spine (L5) to S1 (c), respectively
