Dr. Tator said researchers now recognize the relationship between repeated concussions and depression, a breakthrough on the way to understanding long-term neurological effects of concussions.

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This might also go a long way to understanding why treatments focussing purely on the alcohol side aren't very successful.

BBC: 'Alcoholism is not all about drink'

We endeavor to ensure our analysis of that data is conducted with rigor and consistency, as our ability to achieve a nuanced understanding of the security environment is dependent on collecting and analyzing data in a consistent way over time.

CNN: Transcript of Iraq hearing statements