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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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There are 60,000 miles of blood vessels in every adult human.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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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.

Mononucleosis is caused by the Epstein–Barr virus. Symptoms of the infectious disease are swollen pa Mononucleosis is caused by the Epstein–Barr virus. Symptoms of the infectious disease are swollen pa
Pancreatitis. Inflammation of the pancreas may be the result of a bacterial infection, trauma, or ch Pancreatitis. Inflammation of the pancreas may be the result of a bacterial infection, trauma, or ch
Urinary tract infection. A UTI is characterized by fever, lumbar or abdominal pain, and pain or burn Urinary tract infection. A UTI is characterized by fever, lumbar or abdominal pain, and pain or burn
Abnormalities Caused by Cardiac Pathology Abnormalities Caused by Cardiac Pathology
Muscle weakness caused by myasthenia gravis is evident in the eyes of this patient. Muscle weakness caused by myasthenia gravis is evident in the eyes of this patient.
Chronic disease is caused by a mixture of genetic and environmental influences Chronic disease is caused by a mixture of genetic and environmental influences
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