Amajor advantage of cohort studies over case-control studies with respect to the role of a suspected factor in the etiology of a disease is that:
a. they take less time and are less costly.
b. they can utilize a more representative population.
c. it is easier to obtain controls that are not exposed to the suspected factor.
d. they permit direct estimation of risk of disease in those exposed to the
suspected factor.
e. they can be done on a double-blind basis.

Drug that change your sense of and make you see and hear thing that are not real

Why is it important for health care professional to stay informed about new development?

As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.