Researchers were interested in the long-term health effects related to exposure to wild fires in the Pacific Northwest, which are still considered somewhat rare. Which study design should be used to assess this? • cohort study • cross-sectional study O case-control stul • experimental studyYou are conducting a study on the effects of aspirin therapy on the formation of blood clots and have told the control group not to take any aspirin. A control group participant has a severe headache and takes an aspirin for 7 days in a row. This is an example of: drop-in O placebo effect O bias • drop-out
