Which of the following statements are true of muscle diseases? Select all that apply.

Polio is caused by poliovirus infection, so A is true; it is not caused by a lack of vitamins, making C false. Cancer that starts in muscle is quite rare, so B is true. Some muscle diseases develop later in life, so they are not always congenital, making D false. Excess calcium in the blood can deposit in tissues, including muscle, and cause calcification, so E is true.

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