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12 June, 20:43

Thirty patients with acne volunteer to be treated with either a medicinal lotion

or a normal moisturizing cream. This type of experimental design is called

a (n)

A. in vitro observation

B. clinical trial

c. geographical cohort study

D. general population survey

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  1. 12 June, 21:01
    0
    Thirty patients with acne volunteer to be treated with either a medicinal lotion

    or a normal moisturizing cream. This type of experimental design is called

    a clinical trial.-B.
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