What is a (a) retrospective study? (b) prospective study? (c) longitudinal study? (d) casecontrol study? (e) cross-sectional

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What is a

(a) retrospective study?

(b) prospective study?

(c) longitudinal study?

(d) case–control study?

(e) cross-sectional study?

(f) clinical trial?

(g) blinded study? (h) double-blind study?

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