Fibrodysplasia ossificans progressiva is a very rare disorder, believed to occur in approximately 1 in 2 million people worldwide. Several hundred cases have been reported.
How many people are affected by fibrodysplasia ossificans progressiva ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by fibrodysplasia ossificans progressiva ? [/INST] \n Fibrodysplasia ossificans progressiva is a very rare disorder, believed to occur in approximately 1 in 2 million people worldwide. Several hundred cases have been reported.</s>