RT Journal Article SR Electronic T1 A 65-year-old factory worke with dyspnea on exertion and a normal chest x-ray JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 791 OP 800 VO 67 IS 11 A2 Longworth, David L. A2 Stoller, James K. A1 Saber, Walid A1 Dweik, Raed A. YR 2000 UL http://www.ccjm.org/content/67/11/791.abstract AB