Birt-Hogg-Dub syndrome is rare; its exact incidence is unknown. This condition has been reported in more than 400 families.
How many people are affected by Birt-Hogg-Dub syndrome ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by Birt-Hogg-Dub syndrome ? [/INST] \n Birt-Hogg-Dub syndrome is rare; its exact incidence is unknown. This condition has been reported in more than 400 families.</s>