1 Institute of Veterinary Anatomy-, Histology and -Embryology, University of Giessen, 35392 Giessen, Germany.
2 Institute of Veterinary Anatomy-, Histology and -Embryology, University of Giessen, 35392 Giessen, Germany; Anatomy and Embryology Department, Faculty of Veterinary Medicine, University of Mansoura 35516, Egypt. Electronic address: Mohammed.Elashry@vetmed.uni-giessen.de.
3 Clinic of Small Animals, c/o Institute of Veterinary Anatomy, Histology and Embryology, Justus Liebig University of Giessen 35392, Giessen, Germany.