TY - RPRT TI - Upper gastrointestinal endoscopy: a prospective randomized study comparing continuous supplemental oxygen via the nasal or oral route. AU - G D Bell AU - A Quine AU - J H Antrobus AU - A Morden AU - S M Burridge AU - T J Coady AU - J Lee DO - 10.1016/s0016-5107(92)70424-6 UR - https://pubmed.ncbi.nlm.nih.gov/1607083/ ID - 1607083 ER -