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People about to have surgery must tell their health care providers about all supplements they take.

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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

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