Below is an instruction from Human. Write a response.
    ### Instruction:
    How many people are affected by hypercholesterolemia ?
    ### Response:
    More than 34 million American adults have elevated blood cholesterol levels (higher than 240 mg/dL). Inherited forms of hypercholesterolemia, which cause even higher levels of cholesterol, occur less frequently. The most common inherited form of high cholesterol is called familial hypercholesterolemia.
    