For citations:
Nuralieva GS, Shmidt AE, Nekludova GV, Chikina SY, Avdeev IS. Long-term oxygen therapy with portable oxygen concentrators in patients with chronic respiratory failure. Meditsinskiy sovet = Medical Council. 2026;(9):56-63. (In Russ.) https://doi.org/10.21518/ms2026-233
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