RT Journal Article SR Electronic T1 Respiratory Medicine by Norman M. Johnson JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 233 OP 233 VO 54 IS 3 A2 Zakov, Z. Nicholas A1 Grimm, Mark H. YR 1987 UL http://www.ccjm.org/content/54/3/233.1.abstract AB