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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Walrus Ivory masks made by Yupik in Alaska Walrus Ivory masks made by Yupik in Alaska
An aryballe vase or decanter made for carrying body oils clearly demonstrates that ancient Greeks we An aryballe vase or decanter made for carrying body oils clearly demonstrates that ancient Greeks we
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1.6 Organisms are made up of cells, each of which contains an identical set of genes. 1.6 Organisms are made up of cells, each of which contains an identical set of genes.
Video: Primary and secondary response to infection

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