Institution: | aLaboratory of Epidemiology, Biostatistics and Animal Health Economics, University of Thessaly, 224 Trikalon st., GR-43100 Karditsa, Greece;bSchool of Clinical Veterinary Sciences, University of Bristol, Bristol BS40 5DU, UK;cDepartment of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA |