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Solve it correctly please. I will rate accordingly with multiple votes. Ty-ped answer only. Explain 21. Which is the most effective observational study, a cross-sectional

Solve it correctly please. I will rate accordingly with multiple votes. Ty-ped answer only. Explain

21. Which is the most effective observational study, a cross-sectional study, a cohort study or a case-control study? Explain your

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