Below is an instruction from Human. Write a response.
    ### Instruction:
    How many people are affected by glycogen storage disease type III ?
    ### Response:
    The incidence of GSDIII in the United States is 1 in 100,000 individuals. This condition is seen more frequently in people of North African Jewish ancestry; in this population, 1 in 5,400 individuals are estimated to be affected.  GSDIIIa is the most common form of GSDIII, accounting for about 85 percent of all cases.
    