Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
Classification of bones by shape.
Classification of Burns
Drugs Commonly Prescribed According to Classification
Overview of classification of personality disorders.