If researchers studied Vietnam veterans for 30 years after the veterans' return from Vietnam, the study would be:

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A longitudinal study is a type of observational study where researchers follow the same group of people (or cohort) over an extended period of time, often in intervals. In this scenario, researchers would be studying Vietnam veterans for 30 years, making it a longitudinal study. An epidemiological study primarily focuses on analyzing the patterns and causes of diseases and health conditions in a given population. Incidental studies may refer to unique or unexpected findings from another research study, and experimental studies involve manipulating one or more variables to test cause-and-effect relationships.

If Researchers Studied Vietnam Veterans for 30 Years After the Veterans