Funding for this research was provided by:
Ministry of Health
Received: 5 June 2019
Accepted: 7 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: In accordance with applicable laws and regulations, no specific ethical approval was required for the retrospective analysis of anonymized data collected within the routine influenza surveillance scheme.
: Not applicable.
: The authors declare that they have no competing interests.