[1] Helsinki Univ Hosp, Renal Transplant Unit, Helsinki, Finland
[2] Natl Publ Hlth Inst, Enterovirus Lab, Helsinki, Finland
[3] Russian Acad Med Sci, Inst Poliomyelitis & Viral Encephalitis, Moscow 142782, Russia
[4] Slovak Med Univ, Dept Virol, Bratislava, Slovakia