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This polio survivor is one of the last still using an iron lung ... - NPR
Iron lung - Wikipedia
What Is an Iron Lung, and How Does It Work? | Discover Magazine
Paul Alexander (polio survivor) - Wikipedia
The man in the iron lung: How Paul Alexander lived life to the full - BBC
Lifesaving Breath - Harvard Medical School
Iron lung | Description, History, & Polio | Britannica
How the iron lung paved the way for the modern-day intensive care ... - BBC
What is the iron lung and how does it work? | BBC News
The use of iron lungs as treatment for polio