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Randomized controlled trials should be used when: 1)A participant may be endangered if included in a particular group 2) There is only a small size

Randomized controlled trials should be used when:

1)A participant may be endangered if included in a particular group

2) There is only a small size of participants

3) It is imperative to evaluate the causation as well as the effect of the treatment

4) None of the above

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