title: Letter: Sampling of duodenal contents by a nylon line.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004386:Duodenum / Q000378:metabolism*; D005767:Gastrointestinal Diseases / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D009757:Nylons; D013048:Specimen Handling / Q000379:methods*
chemical_list: D009757:Nylons