Impact of universal two-dose vaccination on varicella epidemiology in Navarre, Spain, 2006 to 2012 García Cenoz, M and Castilla, J and Chamorro, J and Martínez-Baz, I and Martínez-Artola, V and Irisarri, F and Arriazu, M and Ezpeleta, C and Barricarte, A, Eurosurveillance, 18, 20552 (2013), https://doi.org/10.2807/1560-7917.ES2013.18.32.20552