How is QRS duration calculated?

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  1. #boxes
  2. #seconds
  3. #counting
  4. #components
  5. #consists
  6. #normally
  7. #prototypical
  8. #marking
  9. #these
  10. #interval
  11. #paper
  12. #small
  13. #measure
  14. #while
  15. #complex
  16. #missing
  17. #calipers
  18. #three