{{Cite journal| doi = 10.1097/MEJ.0000000000000846| issn = 1473-5695 (Electronic) 0969-9546 (Linking)| volume = 29| issue = 1| pages = 82–84| last1 = Lindner| first1 = G.| last2 = Wolfensberger| first2 = A.| last3 = Exadaktylos| first3 = A. K.| last4 = Schwarz| first4 = C.| last5 = Funk| first5 = G. C.| last6 = Ravioli| first6 = S.| title = Fractional excretion of sodium or urea as prognostic indicators for acute kidney injury in the emergency department| journal = Eur J Emerg Med| date = 2021-12-22| pmid = 34932035}}