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Barbara Schimmer*, Saskia Luttikholt, Jeannine LA Hautvast, Elisabeth AM Graat, Piet Vellema and Yvonne THP van Duynhoven
* Corresponding author: Barbara Schimmer barbara.schimmer@rivm.nl
BMC Veterinary Research 2011, 7:81 doi:10.1186/1746-6148-7-81