Below is an instruction from Human. Write a response.
    ### Instruction:
    How many people are affected by Proteus syndrome ?
    ### Response:
    Proteus syndrome is a rare condition with an incidence of less than 1 in 1 million people worldwide. Only a few hundred affected individuals have been reported in the medical literature.  Researchers believe that Proteus syndrome may be overdiagnosed, as some individuals with other conditions featuring asymmetric overgrowth have been mistakenly diagnosed with Proteus syndrome.
    