title: Biological fluids. Collection, preservation and artefact control.
mesh_terms: D001826:Body Fluids / Q000032:analysis*; D005243:Feces / Q000032:analysis; D005750:Gastric Juice / Q000032:analysis; D006801:Humans; D009566:Nitrates / Q000032:analysis* / Q000097:blood; D009602:Nitrosamines / Q000032:analysis*; D012463:Saliva / Q000032:analysis; D013048:Specimen Handling / Q000379:methods*; D014021:Tissue Preservation / Q000379:methods*
chemical_list: D009566:Nitrates; D009602:Nitrosamines