Primary myelofibrosis is a rare condition that affects approximately 1 in 500,000 people worldwide.
How many people are affected by primary myelofibrosis ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by primary myelofibrosis ? [/INST] \n Primary myelofibrosis is a rare condition that affects approximately 1 in 500,000 people worldwide.</s>