title: The question of methodics in epidemiological studies of persistent substances in human environment.
mesh_terms: D002079:Butter / Q000032:analysis; D003604:Czechoslovakia; D004531:Eggs / Q000032:analysis; D004787:Environmental Pollution / Q000032:analysis*; D004812:Epidemiologic Methods; D005333:Fetus / Q000378:metabolism; D005506:Food Contamination / Q000032:analysis; D006801:Humans; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides / Q000032:analysis; D008895:Milk, Human / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis; D004364:Pharmaceutical Preparations / Q000032:analysis; D012987:Soil / Q000032:analysis; D014867:Water / Q000032:analysis
chemical_list: D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D010573:Pesticide Residues; D004364:Pharmaceutical Preparations; D012987:Soil; D014867:Water; D002079:Butter