RT Journal Article SR Electronic T1 Respiratory follow-up pre- and post-engineering controls or cessation of added diacetyl at four microwave popcorn facilities JF ERJ Open Research JO erjor FD European Respiratory Society SP 00042-2019 DO 10.1183/23120541.00042-2019 VO 5 IS 3 A1 James E. Lockey A1 Timothy J. Hilbert A1 Grace LeMasters A1 Kari K. Dunning A1 Roy T. McKay A1 Linda S. Levin A1 Carol H. Rice YR 2019 UL http://openres.ersjournals.com/content/5/3/00042-2019.abstract AB