title: [Frequent preoccupation with the use N2O].
mesh_terms: D000769:Anesthesia, Inhalation / Q000706:statistics & numerical data; D018685:Anesthetics, Inhalation; D006801:Humans; D009609:Nitrous Oxide
chemical_list: D018685:Anesthetics, Inhalation; D009609:Nitrous Oxide