Institution: | a Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30333, USAb Institute of Experimental Medicine Russian Academy of Medical Sciences, 12 Acad. Pavlov Street, St. Petersburg, 197376, Russiac Nobilon International BV, Wim de Körverstraat 35, 5831 AN, Boxmeer, the Netherlands |