{{Cite journal| doi = 10.1371/journal.pone.0223118| issn = 1932-6203 (Electronic) 1932-6203 (Linking)| volume = 14| issue = 9| pages = –0223118| last1 = Klenk| first1 = L.| last2 = von Rutte| first2 = C.| last3 = Henssler| first3 = J. F.| last4 = Sauter| first4 = T. C.| last5 = Hautz| first5 = W. E.| last6 = Exadaktylos| first6 = A. K.| last7 = Muller| first7 = M.| title = Resource consumption of multi-substance users in the emergency room: A neglected patient group| journal = PLoS One| date = 2019-09-27| pmid = 31557239}}