epidemiological research studies

Search health care journals for examples of epidemiological research studies. Classify each study as descriptive, cross-sectional, retrospective, prospective, or experimental and explain why you have classified it as such. Find examples for each

Cite all sources. Minimum of at least five (5)

please a Minimum of at least five (5) . thank you.

and please use Library(at least 2 sources) :http://infotrac.galegroup.com/default/tam53788?db=PPNU

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