Potential answers for "Part of a clinical trial"

⭐⭐⭐⭐ PHASEII
⭐⭐⭐ PLACEBO
⭐⭐⭐ PLACEBOEFFECT
⭐⭐⭐ PHASEI
⭐⭐⭐ DRUGS
⭐⭐⭐ GUINEAPIGS
⭐⭐⭐ PHASETWO

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