Authors
Andrzej Kowalczyk
andrzej.kowalczyk@piwet.pulawy.pl
Department of Swine Diseases, National Veterinary Research Institute, Pulawy, Poland
Kinga Urbaniak
Department of Swine Diseases, National Veterinary Research Institute, Pulawy, Poland
Iwona Markowska-Daniel
Department of Swine Diseases, National Veterinary Research Institute, Pulawy, Poland