was first detected in

[KLPNO]

Hello everyone
I'm not very sure about the following sentence, especially the part "was first detected in 21 employees". Is "in" the correct preposition to be used?

In 2007 cochlear neuritis was first detected in 21 employees who had worked for the Company for 1-2 years and not everyone of them had been exposed to a harmful factor, i.e. noise

 

[Anglika]

Hello everyone
I'm not very sure about the following sentence, especially the part "was first detected in 21 employees". Is "in" the correct preposition to be used? Yes, it's fine.

In 2007, cochlear neuritis was first detected in 21 employees who had worked for the Company for 1-2 years; not all of these had been exposed to a harmful factor, i.e. noise

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[KLPNO]

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Thank you very much, Anglika.