{{Cite journal| doi = 10.1186/s13049-021-00874-6| issn = 1757-7241 (Electronic) 1757-7241 (Linking)| volume = 29| issue = 1| pages = 59| last1 = Ibsen| first1 = S.| last2 = Lindskou| first2 = T. A.| last3 = Nickel| first3 = C. H.| last4 = Klojgard| first4 = T.| last5 = Christensen| first5 = E. F.| last6 = Sovso| first6 = M. B.| title = Which symptoms pose the highest risk in patients calling for an ambulance? A population-based cohort study from Denmark| journal = Scand J Trauma Resusc Emerg Med| date = 2021-04-22| pmid = 33879211}}