title: [Is so-called "apex" really apex?].
authors.affiliation: Editorial Office, Japanese College of Cardiology, Tokyo.
authors.forename: T
authors.initials: T
authors.lastname: Sakamoto
mesh_terms: D000328:Adult; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013902:Radiography, Thoracic