International linkage of two food-borne hepatitis A clusters through traceback of mussels, the Netherlands, 2012 Boxman, Ingeborg L.A. and Verhoef, Linda and Vennema, Harry and Ngui, Siew-Lin and Friesema, Ingrid H.M. and Whiteside, Chris and Lees, David and Koopmans, Marion, Eurosurveillance, 21, 30113 (2016), https://doi.org/10.2807/1560-7917.ES.2016.21.3.30113