Echovirus type 6 transmission clusters and the role of environmental surveillance in early warning, the Netherlands, 2007 to 2016 Monge, Susana and Benschop, Kimberley and Soetens, Loes and Pijnacker, Roan and Hahné, Susan and Wallinga, Jacco and Duizer, Erwin, Eurosurveillance, 23, 1800288 (2018), https://doi.org/10.2807/1560-7917.ES.2018.23.45.1800288