Weissenbacher-Zweymller syndrome is very rare; only a few families with the disorder have been reported worldwide.
How many people are affected by Weissenbacher-Zweymller syndrome ?
<|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 Weissenbacher-Zweymller syndrome ?<|eot_id|><|start_header_id|>assistant<|end_header_id|> Weissenbacher-Zweymller syndrome is very rare; only a few families with the disorder have been reported worldwide.<|eot_id|>