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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Illicit drug use costs the United States approximately $181 billion every year.
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Thyroid conditions may make getting pregnant impossible.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.