title: Letter: Nickel allergy and valve replacement.
mesh_terms: D004342:Drug Hypersensitivity; D005260:Female; D006350:Heart Valve Prosthesis / Q000592:standards*; D006801:Humans; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D008946:Mitral Valve Stenosis / Q000601:surgery; D009532:Nickel / Q000009:adverse effects*
chemical_list: D009532:Nickel