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: If an ER patient gave an account of symptoms that sounded like those of cluster headaches, would doctors first try to eliminate other diagnoses that were more likely to be the cause?
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.