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Associations between thalamic MOR BPND and positive affect and gray matter in CNBP patients. A, B, Significant negative correlations were found between MOR BPND and positive affect as measured by PANAS in the right thalamus (R thal; A) and left thalamus (L thal; B). C, D, The thalamic MOR BPND was also negatively correlated with gray matter volume in the right (C) and left thalamus (D).
