Nasopharyngeal administration of nitrous oxide-oxygen anesthesia:  a technical note.
FRUMIN
M J
MJ
RACKOW
H
H
D000758:Anesthesia; D000769:Anesthesia, Inhalation; D000776:Anesthesiology; D006801:Humans; D009609:Nitrous Oxide; D010100:Oxygen
D009609:Nitrous Oxide; D010100:Oxygen