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Mortensen, S., Stryhn, H. E., Sogaard, R., Boklund, A., Stark, K., Christensen, J., & Willeberg, P. (2000). Analysis of risk factors for infection of sow herds with porcine reproductive and respiratory syndrome (PRRS) virus. In M. V. Thrusfield & E. A. Goodall (Eds.), . Danish Bacon and Meat Council, Axeltorv 3, DK-1609 Copenhagen V, Denmark.: Roslin, UK: Society for Veterinary Epidemiology and Preventive Medicine.