RT Journal Article SR Electronic T1 Anxiety Disorders in Patients With COPD JF Respiratory Care FD American Association for Respiratory Care SP e131 OP e131 DO 10.4187/respcare.02716 VO 58 IS 10 A1 Samer Alkhuja YR 2013 UL http://rc.rcjournal.com/content/58/10/e131.1.abstract AB