{{Cite journal| doi = 10.1186/s13049-021-00981-4| issn = 1757-7241 (Electronic) 1757-7241 (Linking)| volume = 29| issue = 1| pages = 168| last1 = Meuli| first1 = L.| last2 = Zimmermann| first2 = A.| last3 = Menges| first3 = A. L.| last4 = Tissi| first4 = M.| last5 = Becker| first5 = S.| last6 = Albrecht| first6 = R.| last7 = Pietsch| first7 = U.| title = Helicopter emergency medical service for time critical interfacility transfers of patients with cardiovascular emergencies| journal = Scand J Trauma Resusc Emerg Med| date = 2021-12-09| pmid = 34876188}}