N2O--O2 relative analgesia.
D000766:Anesthesia, Dental; D000768:Anesthesia, General; D000769:Anesthesia, Inhalation; D000771:Anesthesia, Intravenous; D000779:Anesthetics, Local; D001007:Anxiety / Q000517:prevention & control; D002648:Child; D006801:Humans; D007557:Israel; D009609:Nitrous Oxide; D010100:Oxygen
D000779:Anesthetics, Local; D009609:Nitrous Oxide; D010100:Oxygen