Why does caffeine help a spinal headache?

Related questions

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Tags

1. #injection
2. #headaches
3. #intravenous
4. #reducing
5. #cochrane
6. #lower
7. #duration
8. #after
9. #punctures
10. #according
11. #effective
12. #headache
13. #caffeine
14. #caused
15. #puncture
16. #review
17. #spinal