{{Cite journal| doi = 10.1016/j.bja.2021.08.031| issn = 1471-6771 (Electronic) 0007-0912 (Print) 0007-0912 (Linking)| volume = 128| issue = 2| pages = –143-e150| last1 = Kottmann| first1 = A.| last2 = Kruger| first2 = A. J.| last3 = Sunde| first3 = G. A.| last4 = Roislien| first4 = J.| last5 = Heltne| first5 = J. K.| last6 = Carron| first6 = P. N.| last7 = Lockey| first7 = D.| last8 = Sollid| first8 = S. J. M.| title = Establishing quality indicators for pre-hospital advanced airway management: a modified nominal group technique consensus process| journal = Br J Anaesth| date = 2021-10-23| pmid = 34674835}}