original passage: Cluster headaches are relatively uncommon. They affect only 1–3 per thousand people in the world. Cluster headaches affect approximately three times as many men as women.
original sentence: Cluster headaches are relatively uncommon.
sentence2: Knowing the relative probabilities shown above, whenever you see an expensively-produced TV commercial for chronic-migraine medication, would you be justified in thinking that too little time and money is being devoted to the arguably greater problem of cluster headaches?
sentence1: Cluster headaches are nonetheless more common than similar conditions such as chronic migraines. They affect 1–3 per thousand people in the world. Cluster headaches affect approximately three times as many men as women.