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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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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.
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The horizontal fraction bar was introduced by the Arabs.