title: I.3 Problems of contamination and artefact formation in nitrosamine sampling and analysis.
mesh_terms: D004355:Drug Stability; D006801:Humans; D009602:Nitrosamines / Q000032:analysis* / Q000633:toxicity; D013048:Specimen Handling / Q000379:methods / Q000592:standards*
chemical_list: D009602:Nitrosamines