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

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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