Estimating the impact of the 2009 influenza A(H1N1) pandemic on mortality in the elderly in Navarre, Spain Castilla, J and Etxeberria, J and Ardanaz, E and Floristán, Y and López Escudero, R and Guevara, M, Eurosurveillance, 15, 19481 (2010), https://doi.org/10.2807/ese.15.05.19481-en