RT Journal Article SR Electronic T1 The curious incident of groaning in the night-time JF Breathe JO Breathe FD European Respiratory Society SP 123 OP 126 DO 10.1183/20734735.017816 VO 13 IS 2 A1 Ross J. Langley A1 Laura Hill A1 Elizabeth A. Hill A1 Don S. Urquhart YR 2017 UL http://breathe.ersjournals.com/content/13/2/123.abstract AB