RT Journal Article SR Electronic T1 Theophylline in the ambulatory treatment of chronic obstructive lung disease: resolving a controversy JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 197 OP 201 VO 60 IS 3 A2 Vidt, Donald G. A2 Bakst, Alan A1 Snider, Gordon L. YR 1993 UL http://www.ccjm.org/content/60/3/197.abstract AB