Predictors of influenza vaccination among elderly: a cross-sectional survey in Greece - Dardalas, Ioannis; Pourzitaki, Chryssa; Manomenidis, Georgios; Malliou, Faye; Galanis, Petros; Papazisis, Georgios; Kouvelas, Dimitrios; Bellali, Thalia (Aging Clinical and Experimental Research, 2020)