In an observational study, which of the following indicates the authors' conclusions and explains study limitations?
introduction
methodology
results
discussion

In an observational study, During the discussion, the author can indicates conclusion and explains the limitation of the study he did.
This is where the author can give the scope and limitations of his study and also to discuss what is the future use of his study. In introduction is where he can write the reason why he studied his research, in methodology is where he can write when , where and how he did his research and in result is where he can state what problem his research answered or what’s the edge of his research.

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