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 ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by Weissenbacher-Zweymller syndrome ? [/INST] \n Weissenbacher-Zweymller syndrome is very rare; only a few families with the disorder have been reported worldwide.</s>