Authors
Natalia Mazur-Panasiuk
Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland
Jacek Żmudzki
Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland
Grzegorz Woźniakowski
Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland