Are symptoms of silicosis obvious?

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Tags

1. #after
2. #silica
3. #respirable
4. #workers
5. #exposures
6. #associated
7. #chronic
8. #therefore
9. #there
10. #crystalline
11. #common
12. #years
13. #chest
14. #damage
15. #classic
16. #moderate
17. #occurs
18. #silicosis
19. #symptoms
20. #obvious
21. #determine