RT Journal Article SR Electronic(1) A1 Unemo, M A1 Olcén, P A1 Agné-Stadling, I A1 Feldt, A A1 Jurstrand, M A1 Herrmann, B A1 Persson, K A1 Nilsson, P A1 Ripa, T A1 Fredlund, H YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.12.04.00699-es