RT Journal Article SR Electronic(1) A1 Santa-Olalla Peralta, P A1 Cortes-García, M A1 Vicente-Herrero, M A1 Castrillo-Villamandos, C A1 Arias-Bohigas, P A1 Pachon-del Amo, I A1 Sierra-Moros, M J A1 on behalf of the Surveillance Group for New Influenza A(H1N1) Virus Investigation and Control Team in Spain YR 2010 T1 Risk factors for disease severity among hospitalised patients with 2009 pandemic influenza A (H1N1) in Spain, April – December 2009 JF Eurosurveillance VO 15 IS 38 SP 19667 OP DO https://doi.org/10.2807/ese.15.38.19667-en UL https://www.eurosurveillance.org/content/10.2807/ese.15.38.19667-en