What makes football so dangerous?

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Tags

1. #history
2. #least
3. #connected
4. #problems
5. #concussions
6. #football
7. #believed
8. #clinically
9. #might
10. #effects
11. #sport
12. #disease
13. #neurodegenerative
14. #brain
15. #cause
16. #people
17. #behavioral
18. #found
19. #degenerative
20. #about