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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.