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  1. This polio survivor is one of the last still using an iron lung ... - NPR

  2. Iron lung - Wikipedia

  3. What Is an Iron Lung, and How Does It Work? | Discover Magazine

  4. Paul Alexander (polio survivor) - Wikipedia

  5. The man in the iron lung: How Paul Alexander lived life to the full - BBC

  6. Lifesaving Breath - Harvard Medical School

  7. Iron lung | Description, History, & Polio | Britannica

  8. How the iron lung paved the way for the modern-day intensive care ... - BBC

  9. What is the iron lung and how does it work? | BBC News

  10. The use of iron lungs as treatment for polio