Question: https://pubmed.ncbi.nlm.nih.gov/29788532/ Can somone explain this to me? I attached the link for the article. Q. How was the study population selected?(How can I find this

https://pubmed.ncbi.nlm.nih.gov/29788532/

Can somone explain this to me? I attached the link for the article.

Q. How was the study population selected?(How can I find this data?)

Q. How was the size of the sample determined?

Q. How was the ratio of cases receiving the intervention to comparison subjects determined? (Note: only applicable for intervention studies.)

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