[1] University of Veterinary Medicine Hannover,Institute of Animal Breeding and Genetics
[2] Texas A&M University,Department of Pathobiology, College of Veterinary Medicine
[3] Center of Narcolepsy Department of Psychiatry Stanford University School of Medicine,Institute for Reproductive Medicine
[4] University of Veterinary Medicine Hannover,Department of Animal and Poultry Science
[5] University of Saskatchewan,undefined