1. Institute of Animal Reproduction and Food Research of Polish Academy of Sciences Olsztyn Poland
2. Institute for Veterinary Medicine Nicolaus Copernicus University Torun Poland
3. Department of Human Genetics David Geffen School of Medicine University of California Los Angeles CA USA
4. Department of Biostatistics Fielding School of Public Health University of California Los Angeles CA USA
5. Radiation Effects Department Centre for Radiation, Chemical and Environmental Hazards Public Health England Didcot UK
6. Department of Animal Science University of Nebraska Lincoln NE USA