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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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