{{Cite journal| doi = 10.1186/s12879-021-05957-4| issn = 1471-2334 (Electronic) 1471-2334 (Linking)| volume = 21| issue = 1| pages = 271| last1 = Sieber| first1 = P.| last2 = Flury| first2 = D.| last3 = Gusewell| first3 = S.| last4 = Albrich| first4 = W. C.| last5 = Boggian| first5 = K.| last6 = Gardiol| first6 = C.| last7 = Schlegel| first7 = M.| last8 = Sieber| first8 = R.| last9 = Vernazza| first9 = P.| last10 = Kohler| first10 = P.| title = Characteristics of patients with Coronavirus Disease 2019 (COVID-19) and seasonal influenza at time of hospital admission: a single center comparative study| journal = BMC Infect Dis| date = 2021-03-19| pmid = 33731019}}