Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Overall, our results are consistent with those clinical and experimental findings, because the NGF up-regulation is significantly associated with a good outcome of patients, confirming its neuroprotective role after TBI.(11,5) However, little is known about the actions exerted by NGF in determining the mechanisms of neuronal repair and neural connection reorganization in the damaged brain.
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