title: Advances in breath hydrogen quantitation in paediatrics: sample collection and normalization to constant oxygen and nitrogen levels.
mesh_terms: D000388:Air / Q000032:analysis*; D001944:Breath Tests; D002648:Child; D006801:Humans; D006859:Hydrogen / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis
chemical_list: D006859:Hydrogen; D009584:Nitrogen; D010100:Oxygen