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Right hippocampal volume in monozygotic (N = 13 pairs; closed squares) and dizygotic (N = 21 pairs; open triangles) discordant for combat exposure and PTSD. There was a mean 11% smaller volume in the PTSD affected twin compared to each non-PTSD twin brother (2049 mm3 (335 SD) v 2229 mm3 (380 SD) (p = .002).
