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Ultimately you will talk with your colleague and/or mentor about this. But you should “give it a college try” yourself first. They may be retrospective (often a good start before beginning a large, complicated prospective study) , prospective cohort, case-control, epidemiological (nonrandomized, randomized clinical trial – RCT, and others Is there a “gold standard” treatment or intervention? Helpful link: Types of Research Studies |