1. Enterovirus Laboratory, Department of Viral Diseases and Immunology, National Public Health Institute (KTL), Mannerheimintie 166, FIN-00300 Helsinki, Finland
2. Department of Virology, University of Turku, Kiinamyllynkatu 13, FIN-20520 Turku, Finland
3. National Reference Centres, Public Health Office of the Slovak Republic, Trnavska 52, 82645 Bratislava, Slovak Republic
4. State Agency ‘Public Health Agency’, Virology Laboratory, Klijanu Str. 7, LV-1012 Riga, Latvia
5. M. P. Chumakov Institute of Poliomyelitis and Viral Encephalitides of Russian Academy of Medical Science, Kievskoe Shosse 27 km, 142782 Moscow Region, Russian Federation