Why is dementia an umbrella term?

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Tags

1. #possible
2. #thinking
3. #cases
4. #memory
5. #individual
6. #cause
7. #disease
8. #common
9. #dementia
10. #causes
11. #alzheimer
12. #umbrella
13. #changes
14. #there
15. #accounting
16. #percent
17. #including
18. #reasoning