Level of the base of the mitral valve.
D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D006348:Cardiac Surgical Procedures; D005260:Female; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008433:Mathematics; D008722:Methods; D008875:Middle Aged; D008943:Mitral Valve / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D011859:Radiography; D013679:Technology, Radiologic / Q000295:instrumentation; D013997:Time Factors