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Here, cohort is a group of 12-13 year olds.

Amy_D
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  • You seem to have answered the question yourself. But next time, please include the question in the question. A title is to indicate the subject matter and a question should include, well, the question. – David Sep 10 '19 at 21:05

1 Answers1

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Neither works, because you follow up 'with' a cohort. If you rewrite your sentence to say, "The researchers followed up with the cohort after two months."

user3326047
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