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Cerebral blood flow index (CBFi) after repetitive closed head injury (rCHI). Mean (s.e.) CBFi (in units of 10−5 mm2/s) as a function of time for sham (filled circle, n=36) and rCHI (open circle, n=50) mice. The gray-shaded rectangle indicates the time period in which rCHI occurred. *P<0.05, ***P<0.001, unpaired t-test.
