{{Cite journal| doi = 10.1111/bjh.17470| issn = 1365-2141 (Electronic) 0007-1048 (Print) 0007-1048 (Linking)| volume = 193| issue = 6| pages = 1203–1212| last1 = Willekens| first1 = G.| last2 = Studt| first2 = J. D.| last3 = Mendez| first3 = A.| last4 = Alberio| first4 = L.| last5 = Fontana| first5 = P.| last6 = Wuillemin| first6 = W. A.| last7 = Schmidt| first7 = A.| last8 = Graf| first8 = L.| last9 = Gerber| first9 = B.| last10 = Bovet| first10 = C.| last11 = Sauter| first11 = T. C.| last12 = Nagler| first12 = M.| title = A universal anti-Xa assay for rivaroxaban, apixaban, and edoxaban measurements: method validation, diagnostic accuracy and external validation| journal = Br J Haematol| date = 2021-05-07| pmid = 33954979}}