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. 2023 Apr 27;10:1147373. doi: 10.3389/fmed.2023.1147373

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Copyright © 2023 Yadav, Choudhary, Inwati, Rai, Singh, Solanki, Paital and Sahoo.

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Oxygen concentrators. (A) Stationary oxygen concentrator. (B) Portable oxygen concentrator adapted from Hardvella (63).