title: Letter: Water hardness and magnesium in heart muscle.
mesh_terms: D000328:Adult; D000367:Age Factors; D003327:Coronary Disease / Q000209:etiology; D003645:Death, Sudden; D006801:Humans; D008131:London; D008274:Magnesium / Q000032:analysis / Q000378:metabolism*; D008275:Magnesium Deficiency / Q000150:complications; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D012606:Scotland; D014867:Water / Q000032:analysis; D014880:Water Softening; D014881:Water Supply
chemical_list: D014867:Water; D008274:Magnesium