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Vigre, H., Dohoo, I. R., Stryhn, H. E., & Busch, M. E. (2004). Intra-unit correlations in seroconversion to Actinobacillus pleuropneumoniae and Mycoplasma hyopneumoniae at different levels in Danish multi-site pig production facilities. Preventive Veterinary Medicine, 63(1), 9-28. doi:10.1016/j.prevetmed.2004.02.002

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