Potential answers for "One subset of a clinical trial"

⭐⭐⭐⭐ CTRLGROUP
⭐⭐⭐ PLACEBO
⭐⭐⭐ PLACEBOEFFECT
⭐⭐⭐ PHASEII
⭐⭐⭐ PHASEI
⭐⭐⭐ DRUGS
⭐⭐⭐ GUINEAPIGS

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