Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Sarcoidosis? ?
    ### Response:
    Sarcoidosis affects people of all ages and races. However, it's more common among African Americans and Northern Europeans. In the United States, the disease affects African Americans somewhat more often and more severely than Whites.
                
Studies have shown that sarcoidosis tends to vary amongst ethnic groups.
    