RT Journal Article SR Electronic(1) A1 Lyytikaïnen, O A1 Ziese, T A1 Schwartländer, B A1 Matzdorff, P A1 Kuhnhen, C A1 Burger, C A1 Krug, W A1 Petersen, L R YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.02.02.00136-es