Tetrasomy 18p is a rare disorder. It is known to affect about 250 families worldwide.
How many people are affected by tetrasomy 18p ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by tetrasomy 18p ? [/INST] \n Tetrasomy 18p is a rare disorder. It is known to affect about 250 families worldwide.</s>