title: Letter: Effects of entonox on respiratory function.
mesh_terms: D006801:Humans; D008722:Methods; D009609:Nitrous Oxide / Q000494:pharmacology*; D010100:Oxygen; D010993:Plethysmography, Whole Body; D012119:Respiration / Q000187:drug effects*; D013147:Spirometry
chemical_list: D009609:Nitrous Oxide; D010100:Oxygen