TY - RPRT TI - Portable oxygen therapy: assessment and usage. AU - S H Lock AU - E A Paul AU - R M Rudd AU - J A Wedzicha PY - 1991 DO - 10.1016/s0954-6111(06)80186-1 UR - https://pubmed.ncbi.nlm.nih.gov/1759006/ ID - 1759006 ER -