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Continue to ChatJohnson+Johnson Vaccine Follows Pfizer, Moderna, and AstraZeneca into Problem Territory, and Proves Once Again - Clinical Trials Have Limits https://www.theqtree.com/2021/04/12/johnsonjohnson-vaccine-follows-pfizer-moderna-and-astrazeneca-into-problem-territory-and-proves-once-again-clinical-trials-have-limits/