Received: 6 August 2018
Accepted: 4 July 2019
First Online: 23 July 2019
Ethics approval and consent to participate
: For the sentinel laboratory surveillance a statement has been submitted to the Belgian privacy commission which allows the national public health institute to store personal records and the use and presentation of anonymous data for public health purposes. The surveillance fulfills the criteria of the European regulation GDPR.
: Not applicable
: The authors declare that they have no competing interests.