{{Cite journal| doi = 10.1186/s13049-023-01085-x| issn = 1757-7241 (Electronic) 1757-7241 (Linking)| volume = 31| issue = 1| pages = 20| last1 = Fuchs| first1 = A.| last2 = Huber| first2 = M.| last3 = Riva| first3 = T.| last4 = Becker| first4 = S.| last5 = Albrecht| first5 = R.| last6 = Greif| first6 = R.| last7 = Pietsch| first7 = U.| title = Factors influencing on-scene time in a physician-staffed helicopter emergency medical service (HEMS): a retrospective observational study| journal = Scand J Trauma Resusc Emerg Med| date = 2023-04-15| pmid = 37060088}}