title: An epidemiological study of sudden death in hard and soft water areas.
mesh_terms: D000328:Adult; D002318:Cardiovascular Diseases / Q000401:mortality; D003327:Coronary Disease / Q000401:mortality; D003645:Death, Sudden / Q000209:etiology*; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012621:Seasons; D014852:Wales; D014880:Water Softening; D014881:Water Supply