[Studies on esophageal phonocardiography. (Clinical evaluations of its utility and improvement on the pickup using a barium titanate)].
D000293:Adolescent; D000328:Adult; D000368:Aged; D001464:Barium; D004947:Esophagus / Q000502:physiology*; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010701:Phonocardiography
D001464:Barium