{{Cite journal| doi = 10.1136/bmjopen-2018-026923| issn = 2044-6055 (Electronic) 2044-6055 (Linking)| volume = 9| issue = 1| pages = –026923| last1 = Eckart| first1 = A.| last2 = Hauser| first2 = S. I.| last3 = Haubitz| first3 = S.| last4 = Struja| first4 = T.| last5 = Kutz| first5 = A.| last6 = Koch| first6 = D.| last7 = Neeser| first7 = O.| last8 = Meier| first8 = M. A.| last9 = Mueller| first9 = B.| last10 = Schuetz| first10 = P.| title = Validation of the hospital frailty risk score in a tertiary care hospital in Switzerland: results of a prospective, observational study| journal = BMJ Open| date = 2019-01-17| pmid = 30647051}}