title: Further scanning electron microscopic studies of different types of prosthetic heart valves which were in place between two and more than ten years.
mesh_terms: D001021:Aortic Valve / Q000601:surgery*; D001777:Blood Coagulation; D005337:Fibrin / Q000378:metabolism; D006350:Heart Valve Prosthesis; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008943:Mitral Valve / Q000601:surgery*; D013997:Time Factors
chemical_list: D005337:Fibrin