Excess mortality among the elderly in European countries, December 2014 to February 2015., Molbak, K, Espenhain L, Nielsen J, Tersago K, Bossuyt Nathalie, Denissov G, Baburin A, Virtanen M, Fouillet A, Sideroglou T, et al. , Euro Surveill, 2015 Mar 19, Volume 20, Issue 11, (2015)