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A type of study design. Participants are put in different groups and take different kinds and/or different amounts of study drug


A study drug with no active ingredients


A kind of study design in which some participants receive a placebo (a study drug with no active ingredients)


A skin disease in which people have red, itchy, and scaly patches on their skin

Psoriatic arthritis

A disease of the body’s defense system that causes inflammation (redness and swelling), pain, and stiffness in the joints, and psoriasis (an itchy, painful skin problem)