Affiliation: | a Department of Pathology (L.K.), Helsinki University Central Hospital, Helsinki, Finland b Department of Surgery (A.S., R.L., J.A., I.L.), Helsinki University Central Hospital, Helsinki, Finland c Department of Virology (I.L.), Helsinki University Central Hospital, Helsinki, Finland d Department of Medical Microbiology (C.B.), University of Maastricht, Maastricht, The Netherlands |