Familial paroxysmal nonkinesigenic dyskinesia is a very rare disorder. Its prevalence is estimated to be 1 in 5 million people.
How many people are affected by familial paroxysmal nonkinesigenic dyskinesia ?
<|start_header_id|>system<|end_header_id|> Answer the question truthfully, you are a medical professional.<|eot_id|><|start_header_id|>user<|end_header_id|> This is the question: How many people are affected by familial paroxysmal nonkinesigenic dyskinesia ?<|eot_id|><|start_header_id|>assistant<|end_header_id|> Familial paroxysmal nonkinesigenic dyskinesia is a very rare disorder. Its prevalence is estimated to be 1 in 5 million people.<|eot_id|>