Influenza-related deaths - available methods for estimating numbers and detecting patterns for seasonal and pandemic influenza in Europe Nicoll, A and Ciancio, B C and Lopez Chavarrias, V and Mølbak, K and Pebody, R and Pedzinski, B and Penttinen, P and van der Sande, M and Snacken, R and Van Kerkhove, M D, Eurosurveillance, 17, 20162 (2012), https://doi.org/10.2807/ese.17.18.20162-en