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When conducting a study, patients occasionally “crossover” to other portions of the study. List one intervention...

When conducting a study, patients occasionally “crossover” to other portions of the study. List one intervention that may impact the patient after this crossover, how it might affect the results of the study, and which (if any) precautions need to be considered when finding crossover data. Additionally, explain a cohort study, and what types of diseases are best to study using a cohort.

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