Cystic fibrosis (CF) is a rare genetic, chronic, progressive disease that affects over 30,000 people in the United States, and over 70,000 people worldwide.
![A boy with oxygen supply tube holding a sign saying "I sometimes need oxygen to breathe."](https://8kr299.p3cdn2.secureserver.net/wp-content/uploads/2018/04/moments_need_oxygen_480x480-480x362.jpg)
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