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Paget, W.J., Balderston, C., Casas, I., Donker, G., Edelman, L, Fleming, D., Larrauri, A., Meijer, A., Puzelli, S., Rizzo, C., Simonsen, L. Assessing the burden of paediatric influenza in Europe: the European Paediatric Influenza Analysis (EPIA) project. European Journal of Pediatrics: 2010, 169(8), 997-1008