. 2018 Mar 22;23(12):17-00140. doi: 10.2807/1560-7917.ES.2018.23.12.17-00140
This article is copyright of ECDC, 2018.
This is an open-access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0) Licence. You may share and adapt the material, but must give appropriate credit to the source, provide a link to the licence, and indicate if changes were made.