Affiliation: | (1) Respiratory Division, Communicable Disease Surveillance Centre, Public Health Laboratory Service, London, United Kingdom;(2) European Influenza Surveillance Scheme (EISS), Netherlands Institute for Health Services Research (NIVEL), Utrecht;(3) Groupes Régionaux d'Observation de la Grippe GROG coordination centre, Open Rome, Paris, France;(4) Rijksinstituut voor Vollksgezondheid en Milieu (RIVM), Bilthoven, The Netherlands;(5) German Green Cross, Service of Epidemiology, Marburg, Germany;(6) Servicio de Epidemiología, Consejería de Sanidad y Bienestar Social, Junta de Castilla y León, Valladolid, Spain |