Allue M, Sopeña C Ruiz, Gallardo M T, Mateos L, Vian E, Garcia M J, Ramos J, Berjon A C, Viña M C, Garcia M P, Yanez J, Gonzalez L C, Munoz T, Andres C, Tamames S, Ruiz C, Iglesias L A Gómez, Castrodeza J
Regional Office for Public Health in Castilla y León, Spain.
Euro Surveill. 2008 Aug 7;13(32):18948.