title: Changes in water hardness and local death-rates.
mesh_terms: D000367:Age Factors; D002118:Calcium / Q000032:analysis; D002254:Carbonates / Q000032:analysis; D002318:Cardiovascular Diseases / Q000209:etiology / Q000401:mortality*; D004739:England; D005260:Female; D006244:Hardness; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D013997:Time Factors; D014852:Wales; D014867:Water / Q000032:analysis; D014880:Water Softening; D014881:Water Supply
chemical_list: D002254:Carbonates; D014867:Water; D002118:Calcium