Mouratidou E, Lambrou A, Andreopoulou A, Gioula G, et al. Influenza vaccine effectiveness against hospitalization with laboratory-confirmed
influenza in Greece: A pooled analysis across six seasons, 2013-2014 to
2018-2019. Vaccine 2020 Feb 4. pii: S0264-410X(20)30135.
PMID: 32033848