RT Journal Article SR Electronic T1 FEV1/FEV6 May Misdiagnose Patients With COPD JF Respiratory Care FD American Association for Respiratory Care SP 999 OP 1001 DO 10.4187/respcare.04650 VO 61 IS 7 A1 Gregg L Ruppel A1 Jeffrey M Haynes A1 David A Kaminsky YR 2016 UL http://rc.rcjournal.com/content/61/7/999.2.abstract AB