TELEPHONE PHONOCARDIOGRAPHY.
D004562:Electrocardiography; D004864:Equipment and Supplies; D006343:Heart Septal Defects; D006344:Heart Septal Defects, Atrial; D008944:Mitral Valve Insufficiency; D010701:Phonocardiography; D013637:Tape Recording; D013689:Telephone
ELECTROCARDIOGRAPHY; EQUIPMENT AND SUPPLIES; HEART SEPTAL DEFECTS, ATRIAL; MITRAL VALVE INSUFFICIENCY; PHONOCARDIOGRAPHY; TAPE RECORDING