RT Journal Article SR Electronic T1 The Diagnosis of Foreign Bodies in the Lower Air Passages JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 279 OP 282 VO 6 IS 4 A1 Van Ordstrand, H. S. YR 1939 UL http://www.ccjm.org/content/6/4/279.abstract AB