title: Letter: Human materials and study of pollutants.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D012106:Research; D014021:Tissue Preservation; D014470:Umbilical Cord / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D000396:Air Pollutants, Radioactive