RT Journal Article SR Electronic T1 The Necessity of Histology JF Respiratory Care FD American Association for Respiratory Care SP e17 OP e19 DO 10.4187/respcare.03223 VO 60 IS 1 A1 Nataraj, Richard TY A1 Fladeland, Derek A A1 Cockcroft, Donald W YR 2015 UL http://rc.rcjournal.com/content/60/1/e17.abstract AB