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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.