An outbreak of mumps in Sweden, February-April 2004 Sartorius, B and Penttinen, P and Nilsson, J and Johansen, K and Jönsson, K and Arneborn, M and Löfdahl, M and Giesecke, J, Eurosurveillance, 10, 559 (2005), https://doi.org/10.2807/esm.10.09.00559-en