Seroepidemiological study of pandemic influenza H1N1 following the 2009–2010 wave in Greece - Maltezou, Helena C; Katerelos, Panagiotis; Mavrouli, Maria; Lourida, Athanasia; Routsias, John G; Spanakis, Nicholas; Maragos, Antonios; Tedoma, Anastasia; Yiannis Bassiakos; Koratzanis, Georgios; others (Vaccine, 2011)