Is ultrasound harmful to humans?

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Tags

1. #cause
2. #still
3. #damage
4. #cannot
5. #humans
6. #direct
7. #heard
8. #human
9. #hearing
10. #harmful
11. #levels
12. #ultrasound
13. #causes
14. #although
15. #exposure
16. #decibels
17. #excess