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It is funny that hospitals that treat patients by using the most advanced medical devices do not use 4 or 9 as room numbers.

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teacherJapan

It is funny that hospitals that treat patients by using the most advanced medical devices do not use 4 or 9 as room numbers.

I don't see the sense of it, and I don't believe it, but that aside, I would drop "by":

It is funny that hospitals that treat patients using the most advanced medical devices do not use 4 or 9 as room numbers.

Thank you very much, anonymous. Haha, some people are superstitious, I guess:-)