Is ultrasound dangerous to humans?

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